Why Descartes’s “By Their Very Nature” Claim Does Not Apply to Every Cartesian Idea — Astra

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Abstract

Descartes’s claim that the objective mode of being belongs to ideas “by their very nature” (AT VII 42; CSM II 29) appears to support a universal-objective-reality thesis: every Cartesian idea, simply because it is an idea, contains objectively real representational content (OR). That reading is too broad. The passage occurs inside the Third Meditation causal proof, where Descartes is considering ideas under their objective aspect, that is, insofar as they represent or exhibit things with differing degrees of objective reality. It should therefore be read as a thesis about strict ideas, not about every item Descartes elsewhere calls an idea in the broad sense. Strict ideas possess objective reality by their nature because to be a strict idea is to be one of the tanquam rerum imagines [as if images of things], and for Descartes the being that such represented content has in the mind just is objective being.

Broad ideas, by contrast, include immediately perceived occurrent thoughts such as willing, fearing, affirming, denying, and sensing. A single such thought may be considered with respect to its representational character and also with respect to its volitional, affective, judicative, or sensory character, without implying that these must be separate components of the thought. But considering a cognition with respect to its representational character is not a guarantee that every content within it is OR-bearing. A cognition may present positive phenomenal or intelligible content without thereby supplying an OR-bearing representatum [item represented] of the kind ranked by the causal proof. The correct conclusion is not that Descartes’s “by their very nature” claim is false, but that its scope is restricted: objective reality belongs by nature to ideas insofar as they are strict representational ideas, not to every conscious mode that can be called an idea in the broader Cartesian usage. Three worked cases support the independent conclusion that the universal thesis is false: common notions supply the strongest counterexample, the idea of nothing corroborates it, and secondary-quality sensations, such as a cold sensation, provide a further case in which positive phenomenal content occurs formally without constituting an OR-bearing internal representation.

Introduction

The interpretive difficulty is real. In the Third Meditation, Descartes writes: “iste modus essendi objectivus competit ideis ex ipsarum naturâ.” [this objective mode of being belongs to ideas from their own nature.] (AT VII 42; CSM II 29)

Taken in isolation, this sentence seems to say that every idea, simply as an idea, contains objective reality. That is the universal-objective-reality reading.¹See my posts arguing the falsity of the universal readings: “Do Cartesian Sensations Have Objective Reality?: Strict Ideas, Broad Ideas, And Material Falsity In Descartes’s Theory Of Ideas,” “Condensation: Why Objective Reality Cannot Be Descartes’s Theory Of Thought: Burman, Common Notions, And The Failure Of The Strict Idea Model,” its companion piece “Why Objective Reality Cannot Be Universal In Descartes’s Theory Of Ideas: Nothing, Eternal Truths, Sensations, And Fear With Claude Opus 4.6,” and “The Core DTOI Argument: Sensations Without Cartesian Objective Reality.”
It treats Descartes’s claim as if it had the following form: for any Cartesian idea whatsoever, objectively real representational content belongs to it by its nature. On that reading, every sensation, volition, passion, judgment, fear, desire, affirmation, and every immediately perceived mental mode must contain objectively real representational content. Three published formulations make the temptation vivid, and they show why the isolated sentence is not a straw opponent.

Kurt Smith writes that ideas possess objective reality by their very nature, and that only ideas possess both formal and objective reality:

“Descartes says that ideas possess objective reality by their very nature. Equally importantly, ideas are the only items in his ontology that possess both formal and objective reality.” (AT VII 42; CSM II 29)

”Descartes very clearly says that ideas are the items in his ontology that possess objective reality, and they possess it by their very nature.” (AT VII 42; CSM II 29)²Smith in his “Descartes’ Theory of Ideas,” Stanford Encyclopedia of Philosophy, “2. Ideas and The Formal-Objective Reality Distinction,” 3rd paragraph and final paragraph in “5. The Rules: Simple Natures and the Concepts of Clarity and Distinctness.”

Read without a restriction on “ideas,” that statement treats AT VII 42; CSM II 29 as a doctrine about the essence of ideas as such: wherever there is an idea, there is objective being, because that mode of being belongs to an idea by nature. Whether Smith’s formulation carries that unrestricted scope depends on the operative sense of “idea.”

Steven Nadler  treats objective reality as “a defining feature of the mind’s ideas,” and he reaches that result by placing the strict-name restriction of AT VII 37; CSM II 25 immediately beside the “by their very nature” sentence of AT VII 42; CSM II 29.

”We can say, in fact, that for Descartes objective reality is a defining feature of the mind’s ideas: “Some of my thoughts are as it were images of things, and it is only in these cases that the term ‘idea’ is strictly appropriate.” It is essential to an idea that it has a representational content that it displays to the mind. “The objective mode of being belongs to ideas by their very nature.” (Meditation III, AT VII 42; CSM II 29)³Steven Nadler, “The Doctrine of Ideas,” in The Blackwell Guide to Descartes’ Meditations, Stephen Gaukroger, ed., (Malden, MA: Blackwell, 2006), 93.

For a comparative placement of this reading among other commentators, see my “A Hyperlinked Pictorial Table of Cartesian Commentators on the Objective Reality Contents of Secondary Quality Sensations.”

The concatenation is textually tempting. Descartes first says that the name “idea” is strictly appropriate only for thoughts that are as if images of things, and five pages later he says that the objective mode of being belongs to ideas by their nature. Read together, those sentences support an essential claim about strict ideas. The further move is to extend that claim to every later broad use of “idea.” That extension, rather than the essential claim within the strict domain, requires justification.

Last, but not least, Gary Hatfield himself makes the relevant universalizing move explicit:

“I not only take Descartes at his word when he says that ‘the objective mode of being belongs to ideas by their very nature’ (7: 42), but I also take him to be saying with this phrase that all ideas represent.” (Gary Hatfield , “Descartes on Sensory Representation, Objective Reality, and Material Falsity,” in Descartes’ Meditations: A Critical Guide, Karen Detlefsen ed.), Cambridge: Cambridge University Press 2012, 144)

Hatfield’s sentence therefore supports two claims that should be distinguished: the stronger thesis that objective being belongs to all ideas by their nature and the weaker thesis that all ideas internally represent. See my post, “Condensation: Why Objective Reality Cannot Be Descartes’s Theory Of Thought: Burman, Common Notions, And The Failure Of The Strict Idea Model.”

That is the reading this post rejects. AT VII 37; CSM II 25 does restrict the proper name. AT VII 42 does say that objective being belongs to ideas by their nature. What does not follow is that the later sentence is defining every item Descartes is anywhere willing to call an idea, including the immediately perceived forms of willing, fearing, sensing, and the common notions. The formulations quoted above must nevertheless be distinguished. Nadler’s explicit appeal to the strict use of “idea” is compatible with the restricted thesis unless a further argument extends it to every broad idea. Smith’s essentialist wording likewise requires attention to the operative sense of “idea.” Hatfield explicitly draws the inference that all ideas represent, but that thesis must still be distinguished from the attribution of objective reality to every broadly so-called idea. The target here is the unrestricted inference, not the mere assertion that objective reality is essential to strict ideas. Descartes’s sentence occurs inside the causal argument about ideas already under objective consideration. The work of the post is to show first that the passage does not license the unrestricted quantifier, and then that Descartes’s broader usage supplies independently argued counterexamples to the universal thesis.

Descartes’s sentence must be read in its argumentative context. He is not there giving a maximally broad definition of idea. He is developing the causal argument for God’s existence, and that argument turns on the objective reality contained in ideas insofar as they represent different things. The relevant domain is therefore not every conscious mental mode, but ideas under objective consideration: strict ideas whose contents exhibit or represent an item whose objective reality can enter the causal hierarchy, for example, a mode, a finite substance, an infinite substance, or a true and immutable nature.

Two distinct claims are in play, and they should be kept apart. The first is a claim (hereafter, Claim 1: The “by their very nature” claim is restricted to ideas under objective consideration, not every broad-sense idea) about what the text licenses. When Descartes writes that this objective mode of being belongs to ideas by their very nature, the word “ideas” stands without any qualifier, and the universalist takes it to range over every item Descartes anywhere calls an idea. The first claim denies that the passage supplies that range. Read in its place in the causal argument, “ideas” picks out the ideas already under discussion, namely those considered insofar as one represents one thing and another another. On this claim the universalist has not been refuted; he has been shown to be reading into the sentence a scope the sentence does not give him, and the burden returns to him to supply it.

The second claim (hereafter, Claim 2: The universal-objective-reality thesis is false: some broad-sense ideas contain no OR-bearing representational content) is stronger and independent. It holds that the unrestricted thesis is not merely unsupported but false. A single secure counterexample would suffice logically, but the interpretive burden is to establish one without presupposing the restriction thesis. The cases below therefore differ in evidential strength and must be argued separately. The common notions provide the principal case; the idea of nothing corroborates it despite Descartes’s hedge that it can scarcely be called an idea; and secondary-quality sensations supply a further, independently argued case.

This post argues both claims, and by different means. The Third Meditation supports the first through its argumentative sequence. The restriction of the proper name “idea” at AT VII 37; CSM II 25, the quatenus contrast at AT VII 40; CSM II 28, and the demonstrative iste at AT VII 42; CSM II 29 do not, taken together, prove that some ideas lack objective reality. Their roles also differ: the taxonomy supplies the strict use, the quatenus contrast identifies the respect relevant to the causal comparison, and iste maintains continuity with the objective mode already discussed. They support the restricted reading without independently supplying a proof that the strict and broad extensions differ. The independent case against the unrestricted thesis comes chiefly from the common notions discussed in the Conversation with Burman. The idea of nothing corroborates that result, while cold sensation supplies a further and independent case.

The better interpretation preserves the full force of Descartes’s language while restricting its scope. Objective reality does belong to ideas by their very nature when “idea” is taken strictly. It does not follow that every broad idea contains objective reality. The difference is not merely a verbal distinction imposed on Descartes. It is grounded in Descartes’s taxonomy of thoughts in the Third Meditation, in his later broad definitions of “idea,” in the strict/broad distinction attributed to him in the Conversation with Burman, and in the treatment of sensations and material falsity.

The Third Meditation First Restricts the Proper Name “Idea”

The decisive textual point occurs before the “by their very nature” sentence. Descartes begins the relevant stretch of the Third Meditation by dividing thoughts into kinds. Some thoughts are image-like or representation-like. Others include additional forms. His initial description of the first class is: “Quædam ex his tanquam rerum imagines sunt.” [some of these are as if images of things] (AT VII 37; CSM II 25)

He then adds the crucial restriction: “quibus solis proprie convenit ideae nomen.” [to which alone the name idea properly belongs]. (AT VII 37; CSM II 25)

That phrase supplies the starting point for reading the later passage. Descartes has not yet licensed a universal thesis about every conscious mode. On the contrary, he has just said that the name “idea” properly belongs only to those thoughts that are, as it were, images of things. These are strict ideas. They are the thoughts that can function in the causal proof because they can be considered according to what they exhibit objectively.

Descartes immediately distinguishes this class from thoughts that have something more than the likeness of a thing: “Aliae verò alias quasdam praeterea formas habent.” [But others have certain other additional forms] (AT VII 37; CSM II 25; bold not in original)

Those additional forms are willing, fearing, affirming, and denying. Descartes says of such cases: “aliquid etiam amplius quàm istius rei similitudinem cogitatione complector.” [I also include in thought something more than the likeness of that thing] (AT VII 37; CSM II 25)

He also says of this second class: “semper quidem aliquam rem ut objectum meae cogitationis apprehendo.” [I always apprehend some thing as the object of my thought] (AT VII 37; CSM II 26)

That semper (“always,” in the sense of “in every such case”) is the most dangerous clause in the taxonomy for the restriction this post defends, because it appears to universalize the presence of a res as object throughout this second class. But its force must be determined together with its actual grammatical companions. Descartes is not saying that every conscious mode always has a res as object. He is speaking of the thoughts that have additional forms: when I will, when I fear, when I affirm, when I deny. In those cases I always apprehend some thing as the object of my thought, but I also include in thought something more than the likeness of that thing. A fear of a lion, for example, includes the lion as represented object together with the further affective character of fear. The lion supplies OR-bearing representational content; the fear character does not thereby introduce another represented item or a second degree of objective reality.

A fear of a lion can therefore be understood as one unified occurrent thought considered with respect to its representational character, in which it represents the lion, and with respect to its affective character, in which it is fear. The thought is OR-bearing as of the lion; its being fear does not introduce a second representational item or a further objective reality. Likewise, an affirmation that God exists can be one unified thought considered with respect to its representational character, in which it represents God, and with respect to its judicative character, in which it is an affirmation. The idea of God contains infinite objective reality, but the affirmation does not thereby constitute an additional objective-reality content. This aspectual analysis fits the language of the passage especially well, although the anti-universal argument does not depend upon excluding every compositional analysis of such episodes.

What the clause does not do is decide the later case of secondary-quality sensations. Descartes does not list sensing beside willing, fearing, affirming, and denying in this sentence. The additional-form thoughts are operations that take an already apprehended thing as object and add a further form to that apprehension. A cold sensation is not introduced here as an additional form of a likeness. It arrives later in the Third Meditation, and again in the Fourth Replies, as a confused idea of sense whose defect is that one cannot determine whether it exhibits anything positive outside the sensation. Those later texts require an independent analysis; AT VII 37; CSM II 25 does not by itself establish that every sensory mode, like every volition and fear in the class under discussion, always apprehends some res as its object.

A careful universalist will try to use the semper against the sensation case all the same. The move is to treat “when I will or fear I always apprehend some thing” as a general law of Cartesian consciousness, and then to infer that a cold sensation must also apprehend some thing, even if the thing is obscure, confused, or a non-thing taken as a thing. That inference widens the clause beyond the class Descartes is describing. The semper governs the additional-form thoughts. It does not automatically govern every item later called an idea on the broad criterion of immediate perception. The later inquiry into whether a cold sensation exhibits a determinate extra-sensory representatum is therefore not already answered by AT VII 37; CSM II 25. The clause does not reach it.

A clarification is required here, since the phrase “considered with respect to its representational character” is easily misread. The governing question is which content within a cognition, if any, is OR-bearing. The inquiry admits three relevant outcomes. First, the cognition contains a strict internal representation of a representatum whose objective reality can enter the causal hierarchy, for example, a mode, a finite substance, an infinite substance, or a true and immutable nature. The cognition is OR-bearing with respect to that represented content. Second, the cognition contains positive phenomenal content but does not thereby determine an extra-sensory object as the thing sensed. In a cold sensation, for example, phenomenal coolness is formally present as the qualitative character of the sensory mode rather than objectively represented as a positive external quality. Its obscurity may occasion an intellectual uptake construing it as indicative of such a quality, but the sensation itself supplies no determinate extra-sensory OR-bearing representatum for the causal hierarchy to rank. Third, a cognition may contain intelligible, negative, rule-like, or other broad-sense content without itself introducing an OR-bearing representatum. What every occurrent thought shares is its availability to immediate awareness, not possession of objectively real content in every respect.

The requirement that there are no ideas except as if of things governs ideas properly and strictly so called. Thoughts falling outside that strict representational class are therefore not counterexamples to the claim that strict ideas represent; they bear instead on the separate universalist thesis that every item Descartes calls an idea in any sense must contain OR-bearing representational content. This accords with the strict/broad distinction explicitly attributed to Descartes in the Conversation with Burman. The universalist consequently gains nothing merely from observing that a broad cognition can be considered representationally: that does not settle which content within the cognition, if any, actually bears objective reality.

The initial taxonomy therefore supplies a reason against assuming an unrestricted reading. Descartes’s later claim that objective being belongs to ideas by their nature should be read in continuity with the operative sense he has marked: ideas properly so called, the tanquam rerum imagines [as if images of things]. The universal-objective-reality reading must justify extending the later attribution to every conscious mode. The taxonomy does not alone refute that extension, but it prevents treating it as established merely by the occurrence of the word “ideas.”

The Objective-Reality Argument Depends on an “Insofar As” Restriction

The next major consideration is Descartes’s quatenus distinction.⁴In both clauses, quatenus means “insofar as,” “to the extent that,” or “considered under the aspect that.” It marks two respects of the same ideas already under discussion, not two classes of ideas. The construction functions much like a distinction secundum rationem: a distinction according to the aspect under which something is conceived, without by itself requiring a real distinction between two things. The second clause itself concerns ideas that do represent one thing rather than another; it therefore should not be generalized into the separate thesis that every broad-sense cognition necessarily has a representational aspect.
He first considers ideas “quatenus ideae istae cogitandi quidam modi tantùm sunt.” [insofar as those ideas are merely certain modes of thinking] (AT VII 40; CSM II 27) He then introduces the contrasting representational description: “quatenus una unam rem, alia aliam repraesentat.” [insofar as one represents one thing, another another] (AT VII 40; CSM II 28)

This distinction is decisive for the ideas already within the representational comparison. Considered merely as formal mental modes, they have no objective-reality hierarchy: each is a finite mode of thought. Objective reality enters when those ideas are considered insofar as they represent different things. The causal proof needs exactly that second description. It needs the idea of a mode, the idea of a finite substance, and the idea of God to differ according to the objective reality of what they represent. What the passage does not establish is that every conscious mental modification must therefore contain an OR-bearing representatum.

The case for reading the “by their very nature” sentence within the same restricted comparison can be stated in five steps. These are not five independent proofs. They trace the continuous argumentative sequence in which the sentence at AT VII 42 occurs:

1. At AT VII 40, Descartes distinguishes ideas qua modes of thought from ideas qua representing one thing rather than another. The first quatenus is not a denial that the ideas then under comparison represent. It is a restriction of the comparison. Considered merely as modes inhering in the mind, the ideas do not differ in a way the causal argument can use. Each is a finite mode of thought. If the argument stopped there, there would be no hierarchy to explain and no need for a cause proportioned to different degrees of objective reality.

2. Objective reality enters under the second aspect. The inequality required by the causal argument is determined by what the ideas represent: modes, finite substances, and infinite substance. Ideas that represent substances contain more objective reality than those that represent merely modes or accidents (AT VII 40; CSM II 28). The difference is not a difference in consciousness, vividness, or formal reality. It is a difference in the ontological rank of what is represented. That is already a restriction of subject matter. The ideas in play are ideas for which the question of represented rank has already arisen.

3. The discussion then continues specifically with an idea’s containing this rather than that objective reality, and with the demand for a cause containing at least as much formal or eminent reality as the idea contains objectively. The argumentative context is already representationally restricted. Descartes is not asking how a thought can be conscious, or how a volition can be immediately perceived. He is asking how an idea can contain a given degree of objective reality, and why that degree cannot come from nothing. The subsequent attribution of an objective mode of being to “ideas by their nature” answers that causal question. Its role supports continuity with the represented contents already under discussion, although causal function alone does not settle the extension of “ideas.”

4. At AT VII 42 Descartes says not merely modus essendi objectivus, but iste modus essendi objectivus, “this objective mode of being.” In this sequence the demonstrative points back to the objective mode already under discussion: the mode by which what is represented is objectively in the intellect through an idea. The comparative structure clarifies the sentence’s causal function without excluding its essentialist force: “Nam quemadmodum iste modus essendi objectivus competit ideis ex ipsarum naturâ, ita modus essendi formalis competit idearum causis . . .” [For just as this objective mode of being belongs to ideas from their own nature, so the formal mode of being belongs to the causes of ideas] (AT VII 42; CSM II 29). The quemadmodum / ita structure pairs two modes of being in order to block a mistake about causes: one must not suppose that because the reality in the idea is only objective, the cause need contain that reality only objectively. The sentence is doing causal work, but a sentence can perform that work while also expressing an essential claim. Likewise, the backward reference of iste establishes continuity of subject matter without by itself restricting the extension of ideis. A universalist can accept the anaphoric reading while disputing which ideas the noun includes. The case for restricted scope therefore rests on the earlier taxonomy together with the continuing comparison of represented contents, not on the demonstrative alone.⁵Read in isolation, “iste modus essendi objectivus competit ideis ex ipsarum naturâ” naturally sounds universal. AT VII 42 does not by itself prove that ideis ranges only over ideas considered under their representational aspect, and it does not by itself establish that some Cartesian ideas lack objective reality. The surrounding argument prevents treating the unrestricted scope as already established by the isolated wording. The inference from “this objective mode of being belongs to ideas by their very nature” to “every Cartesian idea whatsoever has objective reality by its very nature” requires an additional premise: that ideis at AT VII 42 ranges over every item Descartes calls an idea in any sense, rather than over the ideas already being considered quatenus . . . repraesentat. The passage itself does not supply that unrestricted quantifier. The independent case against the universal thesis comes later, chiefly from common notions, with the idea of nothing and cold sensation supplying corroborating and independent pressure. The burden of proof falls upon the universalist to show the unrestricted range.

5. Descartes then describes the relevant ideas as veluti quasdam imagines, “like certain images” (AT VII 42; CSM II 29). That is not a new metaphor introduced for decoration. It returns the discussion to the class marked at AT VII 37; CSM II 25: the tanquam rerum imagines to which the name “idea” properly belongs. An image-like idea can fall short of the perfection of the thing from which it is taken, but it cannot contain more reality than that thing. The comparison makes sense within the representational domain whose contents are being ranked. It does not establish a thesis about every immediately perceived form of thought.

The conclusion of this sequence should be limited in just the way the five steps warrant. AT VII 42; CSM II 29 does not prove that some ideas lack objective reality. Claim 1 (The “by their very nature” claim is restricted to ideas under objective consideration, not every broad-sense idea) is not that proof. The sequence supports reading the sentence as a claim about ideas within the representational comparison in which one represents one thing and another another. Extending that claim to every item Descartes calls an idea requires an additional justification for the broader scope. Neither the demonstrative nor the causal function of the sentence independently settles that scope, and the sequence does not supply the premise needed for the unrestricted inference.

The structure of the causal proof reinforces this reading of the operative comparison. Descartes writes: “in quo omnis realitas formaliter contineatur, quae est in ideâ tantùm objective.” [in which all the reality is contained formally which is in the idea only objectively] (AT VII 42; CSM II 29)

This is not a theory of consciousness in general. It is a rank-preserving causal principle applied to objective reality in ideas. The idea contains the relevant reality objectively; the first and principal cause must contain that same reality formally or eminently. The proof works because represented contents can differ in objective-reality rank. The proof does not require, and provides no support for, the flattening thesis that every conscious mode has OR merely because it is conscious.

The universal-objective-reality reading therefore mistakes a restricted causal-metaphysical claim for an unrestricted theory of all occurrent thought. Descartes’s point is not that consciousness entails objective reality. His point is that represented content, considered objectively, has a mode of being that requires an adequate cause.

“By Their Very Nature” Should Not Be Weakened, but Its Scope Must Be Restricted

The best interpretation should not try to weaken Descartes’s language. He does not say that objective being merely happens to accompany some ideas. He says it belongs to ideas by their nature. That is a strong claim, and it should be retained. A strict idea does not first exist as a purely formal mental event and then contingently acquire objective being from an additional act. To be a strict idea is to be a mental mode whose represented content possesses objective being in the intellect.

But a strong claim within a restricted domain is not a universal claim over every broader use of a term. The issue is scope. Descartes’s sentence is true of ideas insofar as they are strict representational ideas. It does not follow that it is true of everything called an idea when “idea” is taken broadly for the immediately perceived form of any thought.

This is the central logical point. From the claim that objective reality belongs by nature to ideas in the relevant strict sense, it does not follow that objectively real representational content belongs to every Cartesian idea in every sense of “idea.” Nor does it follow that every conscious mode contains an OR-bearing internal representation. The universal reading equivocates between two extensions of the term. In the causal proof, “idea” is governed by the strict tanquam rerum imagines context. In broader Cartesian usage, “idea” can name the immediately perceived form of an occurrent thought. The same word does not guarantee the same quantifier domain.

The strongest compact reply available to the universalist should be faced here. If objective being belongs to ideas ex ipsarum naturâ, why not infer that anything lacking objective being is, by that fact, not an idea in the sense of the sentence? The reply is compact because it does not require ignoring AT VII 37; CSM II 25, and it does not require treating “by their very nature” as loose or honorary. The inference is a contraposition, not a conversion. From the premise that every idea in the operative sense possesses objective being, it validly follows that anything lacking objective being is not an idea in that same sense. The universalist may therefore exclude common notions, the idea of nothing, and cold sensation from the strict class. But excluding them from that class does not exclude them from every Cartesian use of “idea.”

The logical operation is valid; the disputed move is a change in the sense of “idea.” From the claim that every strict idea has objective reality, contraposition yields only that a thought lacking objective reality is not a strict idea. No biconditional is required. The restriction thesis accepts that result. What does not follow is that a thought which fails the strict test is not an idea in any sense Descartes recognizes. The Second Replies, the Third Replies, and the Conversation with Burman supply the broader extension: an idea may also be the immediately perceived form of a thought. The natura named at AT VII 42; CSM II 29 belongs to the ideas under objective consideration in the causal proof, which is why the next sentence can call the relevant ideas veluti quasdam imagines (AT VII 42; CSM II 29). “By their very nature” remains an essentialist claim about ideas taken objectively. It is not a license to exclude from every broader Cartesian use of “idea” whatever fails the strict representational test.

The governing question concerns the idea under examination, not merely the larger episode in which it occurs: which content within the cognition, if any, is OR-bearing? Objective reality in an accompanying strict idea does not thereby belong to another idea associated with it. That issue is distinct from determining which aspects of one cognition possess objective reality. A broad cognition may contain representational content together with volitional, affective, judicative, or sensory character. On an aspectual analysis, these can be different respects of one unified cognition; on a compositional analysis, some may instead be distinct components within a single episode. The restriction thesis does not depend on settling that architectural question. On either model, objective reality belongs only where OR-bearing representational content is present.

Thus the most precise thesis is not simply “only strict ideas have OR,” if that is heard as a crude classification of whole mental episodes. The better thesis is content-sensitive: objective reality belongs by nature to strict representational content within cognition. Broad thoughts may be OR-bearing with respect to represented content without their volitional, affective, judicative, or sensory character thereby being OR-bearing, and some broad thoughts supply no OR-bearing representatum at all.

The Second Replies Give a Broad Definition of Idea Based on Immediate Awareness

The strict use in the Third Meditation is not Descartes’s only use. In the Second Replies, Descartes gives a broad definition of idea: “Ideae nomine intelligo cujuslibet cogitationis formam.” [By the name idea I understand the form of any thought] (AT VII 160; CSM II 113)

He immediately explains the consciousness condition: “per cujus immediatam perceptionem ipsius ejusdem cogitationis conscius sum.” [by whose immediate perception I am conscious of that very thought] (AT VII 160; CSM II 113)

This is not the definition of idea operative in the objective-reality hierarchy. It is broader. It identifies an idea with the form of any thought by whose immediate perception one is conscious of that thought. The point is not that every such form represents a thing with objective reality. The point is that every occurrent thought is immediately present to the mind. The definition belongs to the doctrine of consciousness, not to the causal proof’s ranking of representational contents.

The definition supplies a criterion of ideahood distinct from possession of objective reality: immediate awareness of the thought. That distinction does not by itself prove that the strict and broad uses differ in extension. A universalist may maintain that every immediately perceived thought also contains represented content. The point established here is narrower: the definition does not make objective reality the stated ground of broad ideahood. Whether some broad ideas lack OR must be established by independent cases. Equally, broad ideahood does not entail absence of objective reality: a fear of a lion can contain OR-bearing content representing the lion without its affective fear character becoming another represented item.

This also avoids a regress. If the occurrence of a fear required a further strict idea representing the fear in order for the fear to be conscious, then the awareness of that further idea would require yet another strict idea, and so on. Descartes’s approach avoids such a regress because occurrent thoughts are directly and immediately perceived. Immediate perception is not the same as a thought containing OR. The fear can be a conscious fear without containing, in itself, the objective reality of fear-as-object. A later reflective idea of fear may represent fear as a mental mode, and that second-order strict idea may have mode-level objective reality. But that does not show that the original fear was already an internal representation of itself.

A further question remains. Granting that the fear does not represent itself, what represents the lion? Two analyses are available. On the aspectual analysis, one occurrent thought is fear and represents the lion, and these are two respects under which the single thought is considered. On a compositional analysis, the episode contains a strict idea of the lion, which bears objective reality, together with a distinct affective mode of fear. The two analyses agree on the point relevant here: the presence of OR-bearing content representing the lion does not make the fear character itself OR-bearing. They differ about the internal architecture of the episode.

The aspectual analysis has substantial textual support. Descartes’s own division at AT VII 37; CSM II 25 is not expressed as a division between representations and separate accompaniments of representations. It is a division between thoughts that are as if images of things and thoughts that have certain other forms in addition, where the additional form is predicated of the same thought that includes the likeness: when I will or fear, he says, I include in thought something more than the likeness of the thing. That grammar naturally supports an aspectual reading of one thought under different respects, although it need not settle the metaphysics of the episode against every compositional alternative. The Third Replies strengthens the point relevant to the present argument, since Descartes there counts willing and fearing as ideas themselves on the ground that they are immediately perceived.

The Third Replies Confirm That Volition and Fear Count as Ideas Only in the Broad Sense

The same broad usage appears in the Third Replies. Descartes writes: “ideam enim voco omne id quod est immediate a mente perceptum.” [for I call an idea everything that is immediately perceived by the mind] (AT VII 181; CSM II 127–28)

Descartes then gives the relevant examples: “cum volo, vel timeo, quia simul percipio me velle & timere.” [when I will, or fear, because I simultaneously perceive that I will and fear] (AT VII 181; CSM II 127–28)

The passage confirms the ground of the broad use without independently refuting universal objective reality. Volition and fear count as ideas because they are immediately perceived, not because their volitional and affective characters are assigned an objective degree. They may nevertheless contain OR-bearing content with respect to what is willed or feared. The distinction is between the reason a thought qualifies as a broad idea and the represented content, if any, through which the cognition possesses objective reality. For the fuller taxonomy, see “Strict and Broad Ideas in DTOI.”

Three Cases, and What Each Can Show

Claim 2: The universal-objective-reality thesis is false: some broad-sense ideas contain no OR-bearing representational content is supported by a family of counterexamples, not one example restated three times. Each case answers a different universalist reply, and the reply available in one case does not transfer automatically to the others. The common notions provide the principal case because Descartes treats them as ideas in a broader use while denying that they are strictly ideas of things. The idea of nothing corroborates that distinction even though Descartes says that it can scarcely be called an idea. The cold sensation supplies a further case: its positive phenomenal content, namely phenomenal coolness, occurs formally rather than as its objectively represented item. The uncertainty about whether anything positive is exhibited outside the sensation does not independently establish that conclusion. The cases therefore differ in evidential strength and must not be flattened into a single illustration.

Case	What Descartes calls it	Why it bears on universalism	Limit of the case
Common notions	Ideas “taken more broadly,” not strictly ideas of things (AT V 153; CSMK III 338)	Classified as broad-sense ideas and not strictly as ideas of things	The universalist can posit thin OR for an eternal truth, relation, or principle; an additional argument is needed to identify an OR-bearing representatum and place it within the Meditation III hierarchy
Idea of nothing	An idea, but “only negative” and “scarcely” an idea (AT V 153; CSMK III 338)	Negative thought for which no positive OR-bearing representatum is supplied	The vix vocari potest hedge blocks using it as the lead exhibit; it remains corroboration
Cold sensation	An idea of sense, materially false (AT VII 43–44, 233–35; CSM II 30, 163–64)	Phenomenal coolness is formally present, while the sensation does not determine a positive extra-sensory OR-bearing representatum	The most contested case; uncertainty in the Fourth Replies does not alone establish absence of OR, which requires the argument distinguishing formal sensory presence from objective representation

The Conversation with Burman Provides Direct Evidence for Descartes’s Strict and Broad Uses of Idea

The Conversation with Burman provides direct evidence that Descartes distinguished stricter and broader uses of the term “idea” and could invoke that distinction when an unrestricted reading would otherwise be misleading. Frans Burman (1628 to 1679) raises the idea of nothing against the claim that there are no ideas except as if of things. Descartes answers: “Illa idea est solùm negativa, et vix vocari potest idea.” [That idea is only negative and can scarcely be called an idea] (AT V 153; CSMK III 338)

He then gives the decisive restriction: “auctor autem hîc sumit ideam proprie et stricte.” [the author here takes idea properly and strictly] (AT V 153; CSMK III 338)

And he explicitly contrasts this with a broader use: “sed tum idea latius sumitur.” [but then idea is taken more broadly] (AT V 153; CSMK III 338)

This passage bears on the unrestricted reading in a specific way that should not be overstated. Descartes says that the author takes idea properly and strictly here, and the demonstrative picks out the passage Burman raised, not the “by their very nature” sentence at AT VII 42; CSM II 29. The remark therefore does not show, by itself, that the causal proof employs the strict sense. What it shows is that Descartes’s usage is context-sensitive and that a strict/broad distinction is explicitly attributed to him in the Conversation with Burman. The distinction is therefore not merely an external interpretive convenience, and it is independently consonant with the Third Meditation’s restriction of the name “idea” to thoughts tanquam rerum imagines. The same kind of restriction may accordingly govern the passage at AT VII 42; CSM II 29.

The Burman evidence also blocks a common objection. One might argue that if Descartes says “ideas” without qualification at AT VII 42; CSM II 29, he must mean all ideas without restriction. But Burman shows that this inference is unsafe. Descartes can employ “idea” in a strict sense supplied by context even where the term itself is not accompanied by an explicit restricting adjective. The correct question is therefore not simply whether the word “idea” appears, but which use of “idea” is operative in the passage.

The role of this evidence for Claim 1 (The “by their very nature” claim is restricted to ideas under objective consideration, not every broad-sense idea) is therefore to remove an objection rather than independently determine the scope of AT VII 42. The universalist’s prima facie point is that Descartes writes ideis without qualification, and that an unqualified plural should be read as unrestricted. Burman shows why that presumption is unsafe. The case for the operative sense at AT VII 42; CSM II 29 must still come from the local argument, not from transferring Burman’s contextual restriction directly to another sentence. The five steps above supply that contextual case through the taxonomy, the quatenus contrast, the demonstrative iste, and the following veluti quasdam imagines, with the distinct evidential roles already specified.

The passage has a second and independent bearing on the dispute. That bearing is Claim 2 (The universal-objective-reality thesis is false: some broad-sense ideas contain no OR-bearing representational content), and it does not depend on any claim about what Descartes means at AT VII 42; CSM II 29.

Descartes makes two distinct remarks in the exchange. They should not be treated as one remark with two examples. The first concerns the idea of nothing. The second concerns the ideas of common notions. For Claim 2, the second is the lead exhibit, because Descartes calls the common notions ideas in the same breath in which he denies that they are, strictly speaking, ideas of things, and because he assigns them to a more extended use of the word without the hedge he attaches to nothing.

A common notion such as the principle that what is done cannot be undone, or that nothing comes from nothing, is immediately perceived, and so is an idea in the broad sense of the Second Replies and Third Replies. It is not a defective or unofficial thought. It is among the materials of the causal argument itself. Yet Descartes does not classify the common notion itself as a thing or an affection of a thing. He classifies such common notions instead as eternal truths, and in the Conversation with Burman they are treated as ideas only in the broader sense rather than, strictly speaking, as ideas of things. The important contrast is therefore not between meaningful and meaningless thought, but between intelligible principles and the strict exhibition of things.

A universalist can grant that last distinction and still assign the common notions a thin objective reality, understood as the being-in-the-intellect of an eternal truth, a relation, or the common notion itself. The objection is natural, and it is the one this case must answer. In the Principles, Descartes distinguishes things and their affections from eternal truths and also treats universals as modes of thinking by which the mind considers things (Principles I.48 through I.50, I.58 through I.59; AT VIIIA 22–24, 27–28; CSM I 208–9, 212–13). The objective-reality hierarchy at AT VII 40–42; CSM II 27–29, by contrast, ranks represented items according to the reality of what is represented: modes or accidents below finite substances, and finite substances below infinite substance. A common notion, classified as an eternal truth rather than as a thing or affection of a thing and as not strictly an idea of a thing, does not straightforwardly fall within that hierarchy. The universalist therefore owes an additional argument identifying an OR-bearing representatum and explaining how it enters the hierarchy.

The common notion thus supplies the principal case of perfectly intelligible and even necessary thought whose content is not the exhibition of an item ranked by the objective-reality hierarchy. Its conceptual determinacy, necessity, inferential role, and generality do not by themselves establish objective reality. The positive ground for denying it objective reality is its character as an intelligible principle governing judgments about things, together with Descartes’s classification of it as a broad idea rather than strictly an idea of a thing. The argument is not merely that the universalist has yet to name its object.

The strongest reply identifies the truth itself, or causal dependence, as the alleged representatum of the common notion that nothing comes from nothing. Neither proposal can be dismissed merely because the axiom is general or necessary: an idea of a true and immutable nature can also have those features. The relevant distinction is instead Descartes’s classification of common notions as ideas only in the broader use, rather than strictly as ideas of things. Calling the axiom an eternal truth describes its status as a principle; it does not yet establish that apprehending it involves the objective exhibition of a further item. Likewise, construing the axiom as the representation of a particular causal dependence substitutes an instance governed by the principle for the principle itself. A general thesis about what can arise from nothing is not simply an image of one causal transaction. The burden is therefore not merely to identify something about which the proposition is true, but to show that apprehending the proposition itself involves the objective exhibition of an item distinct from the proposition’s inferential or predicative content.

The distinction between the principle and the represented items involved in its application is equally important. An application of the axiom to a stone or to God may involve objectively real content representing that substance. This does not show that the common notion, as the principle governing the inference, possesses objective reality. On the interpretation defended here, the common notion itself lacks it; objective reality belonging to an associated idea of a substance does not transfer to the principle. Conversely, denying objective reality to the common notion does not deny it to the represented substances in such an application. The counterexample concerns the common notion as such, not the claim that every episode of reasoning with it is devoid of objective content. For the developed argument, see “Condensation: Why Objective Reality Cannot Be Descartes’s Theory of Thought: Burman, Common Notions, and the Failure of the Strict Idea Model.”

Nor can the missing objective content be supplied merely by identifying the apprehension of the common notion as a mental mode. Performing an intellectual operation is not thereby representing that operation. The apprehension has formal reality as an occurrence of thought; a reflective idea of that apprehension would instead represent a mental mode. The existence of the former does not establish the presence of the latter within the original apprehension. This distinction answers the proposed minimal objective reality without requiring a separate argument about genus and species. See “Do Cartesian Universals Have Objective Reality? Genus, Species, And Modes Of Thinking Without Representata.”

The idea of nothing corroborates the same conclusion, but it cannot lead the case. Descartes says that the idea is only negative and can scarcely be called an idea, yet he does not deny that such a thought occurs, and Burman’s question presupposes that it does. The thought therefore belongs on the broader side of the distinction reported in the conversation: it is an immediately perceived form of thought but only dubiously an idea when “idea” is taken properly and strictly. The opponent’s reply is obvious, and it should be stated at full strength. If the thought can scarcely be called an idea, it does not by itself refute a thesis about ideas. A universal claim is a claim about all members of a class, and an item admitted into the class only with a warning is a poor instrument with which to convict the claim.

The reply has force against any attempt to make nothing the lead counterexample. It does not erase the case. Descartes is still willing to speak of “that idea.” He does not say that there is no such thought. He says that the thought is only negative and can scarcely be called an idea when “idea” is taken properly and strictly. That places the case on the broader side of the strict/broad distinction reported in the conversation rather than establishing that every broad-sense thought must satisfy the conditions governing strict ideas. The case therefore survives as corroboration: even an item Descartes is reluctant to honor with the strict name is handled by distinguishing uses of “idea,” not by insisting that every thought called an idea contains objective reality.

Ask now what the thought of nothing exhibits. Nothing does not designate a positive Cartesian item of any ontological rank. Thinking nothing is therefore not the representation of a peculiar entity whose degree of reality is zero; it is a negative thought whose occurrence does not by itself supply a positive representatum for the causal hierarchy to rank. The thought accordingly supplies no OR-bearing represented item whose degree of objective reality the causal principle of AT VII 40–42 could rank or whose objective being would require an adequate cause.

The same distinction answers the proposal that the idea of nothing acquires objective reality by representing a negating act. Performing a negation does not require making that operation the object of the thought. Representing an act of negating, conversely, does not by itself perform the negation. Positive ideas employed in thinking an absence may possess objective reality, but their presence does not turn the absence into a further positive representatum. See the argument developed in “Privations, Sensations, and Objective Reality: A Closer Look at Arnauld’s Misinterpretation of Descartes’s Ideas.”

The argumentative structure is therefore cumulative. For Claim 1 (The “by their very nature” claim is restricted to ideas under objective consideration, not every broad-sense idea), the Conversation with Burman removes the presumption that every unqualified occurrence of “ideas” must range over every broad-sense idea. For Claim 2 (The universal-objective-reality thesis is false: some broad-sense ideas contain no OR-bearing representational content), the common notions provide the principal case: Descartes classifies them as ideas in the broader use but not, strictly speaking, as ideas of things, and their content functions as an intelligible principle rather than as an objectively exhibited item. Neither their application to represented substances nor their formal reality as intellectual occurrences supplies them with objective reality. The qualified description of the idea of nothing then corroborates that result. On the interpretation defended here, these cases make the universal thesis false, not merely unlicensed by AT VII 42; CSM II 29. Their force does not depend on accepting the further account of sensation considered next.

Sensations Show That Presentation Is Not the Same as Objective Reality

Sensations give independent support for the same conclusion. In Principles I.66 through I.71 Descartes distinguishes what is clearly contained in a sensation from the further judgment that a resembling quality exists in the body (AT VIIIA 32–36; CSM I 216–19). Sensations, passions, and appetites can be clearly perceived if one does not judge more than what is contained in one’s perception: “Superfunt sensus, affectus, & appetitus, qui quidem etiam clarè percipi possunt.” [there remain sensations, affects, and appetites, which indeed can also be clearly perceived] (AT VIIIA 32; CSM I 216)

He later marks the crucial difference between considering pain and color merely as sensations or thoughts and judging them to be things outside the mind: “dolorem quidem & colorem, & reliqua ejusmodi, clarè ac distinctè percipi.” [pain, color, and the rest of this kind are clearly and distinctly perceived] (AT VIIIA 33; CSM I 218)

A cold sensation is a further case of an idea in the broad sense, distinct from Burman’s two classes. The argument requires separating Descartes’s statement of uncertainty about what the sensation exhibits from the positive account of the manner in which its phenomenal character is present. The former blocks an inference to objective reality; the latter supports the conclusion that the sensation itself lacks it.

Descartes’s claim is an undetermined question about extra-sensory exhibition. He calls the idea materially false “propter hoc tantùm . . . quod, cùm sit obscura & confusa, non possim dijudicare an mihi quid exhibeat quod extra sensum meum sit positivum, necne.” [for this reason only . . . that, since it is obscure and confused, I cannot determine whether it exhibits to me something that is positive outside my sensation, or not] (AT VII 234; CSM II 163–64) The defect is not that the sensation exhibits nothing positive. It exhibits phenomenal coolness. The defect is that, from the sensation itself, I cannot determine whether it also exhibits something positive outside the sensation.

Phenomenal coolness is not thereby a representatum [item represented] of the cold sensation. This does not mean that phenomenal coolness is not a mode of mind or that a mental mode could never itself become an object of representation. It means that, within the cold sensation as such, phenomenal coolness occurs as the formally real qualitative character of the sensation rather than as a distinct objectively real content represented by it. What remains absent is a determinate extra-sensory representatum, not positivity as such.

The second claim is the positive conclusion defended here: the cold sensation itself lacks OR. That conclusion does not follow from the inability to determine whether something positive outside the sensation is exhibited. Epistemic uncertainty alone does not establish the absence of represented content. The argument instead turns on the distinction between formal and objective presence: phenomenal coolness occurs as the sensation’s qualitative character, not as an item objectively represented by that sensation; construing it as a positive bodily quality belongs to the subsequent uptake. On this account, neither the sensation’s own positivity nor that further construal supplies it with a representatum whose degree of objective reality the causal principle of AT VII 40–42 could rank. The relevant objective being must belong to represented content in the sensation itself. This applies the account of objective reality already in force: objective reality is the being in the intellect of a representatum insofar as it is represented there. The uncertainty passage blocks a proposed inference to objective reality; the account of the content’s manner of presence supplies the positive argument for its absence.

Phenomenal coolness is therefore not excluded because it fails to be a Cartesian mode. On the contrary, as actually occurring in consciousness it belongs to the formal reality of the sensory mode. What excludes it from the objective-reality calculation in this sensation is its manner of presence: it is phenomenally presented, not objectively represented. A formally real mental mode can itself become a representatum in another act of thought, but it does not acquire objective reality merely by occurring phenomenally in the sensation.

It is not that the sensation purports to exhibit an external quality and fails. There is no such purport in the sensation. What the sensation has is vivid phenomenal positivity together with obscurity, and obscurity here means that the sensation by itself does not determine any object as the thing sensed. The appearance that the sensation presents an external quality as its object is contributed at the next stage, by the uptake that construes the phenomenal character as the presence of such a quality. Cold therefore belongs with thoughts that fall outside the strict tanquam rerum imagines class, but it is not the same kind of case as the idea of nothing or some of the common notions. Nothing is merely negative. A common notion is an intelligible rule. A cold sensation supplies a positive phenomenal basis for error. That is why it has to be argued from the Fourth Replies and from Principles I.66 through I.71, not treated as a third Burman example.

The obscurity of the sensation provides the occasion for that further construal: “obscuritas verò, quæ sola mihi dat occasionem judicandi istam ideam sensûs frigoris . . . ” [but the obscurity, which alone gives me occasion for judging that idea of the sensation of cold . . . ] (AT VII 234–35; CSM II 164) The sensation supplies the positive phenomenal basis for the error without itself determinately representing an external quality. The Fourth Replies strongly supports this distinction. On the supposition that cold is merely a privation, Descartes denies that the sensation contains cold itself objectively in the intellect and identifies what is positively present instead as a certain sensation having no being outside the intellect: “si frigus sit tantùm privatio, frigoris idea non est frigus ipsum, prout est objective in intellectu, sed aliud quid quod perperam pro istâ privatione sumitur; nempe est sensus quidam nullum habens esse extra intellectum.” [if cold is only a privation, the idea of cold is not cold itself as it is objectively in the intellect, but something else that is wrongly taken for that privation, namely a certain sensation having no being outside the intellect] (AT VII 233; CSM II 163) The mistaking belongs to the uptake, not to the sensation.

Nor does this collapse the idea into a judgment. Descartes forestalls that charge in the same passage: “Nec sane judicium cum ideâ confudi; nam in hac dixi reperiri falsitatem materialem, in illo verò non potest esse nisi formalis.” [Nor indeed have I confused judgment with idea; for I said that material falsity is found in the latter, while in the former there can be none but formal falsity] (AT VII 233; CSM II 163) The sensation and the uptake are two states within one episode, not an idea replaced by a judgment. Here “uptake” names the further construal without settling whether it is already an act of assent or an apprehension preceding assent. Material falsity remains in the obscure sensory idea; formal falsity belongs to an erroneous judgment. For the full analysis of this two-state structure, see my “Cold Sensation Without Objective Reality: One Episode Or Two States In The S1–D1 Assent Structure Of Descartes’s Theory Of Ideas.”

The lesson is that a sensation can be clearly perceived as a sensory mode without thereby exhibiting an external secondary quality as an OR-bearing representatum. Pain, color, heat, and cold are immediately present in consciousness. They are formal mental modes. But when the mind treats them as resembling or revealing qualities in bodies, the mind moves beyond what is clearly contained in the sensory perception. The error is not in the occurrence of the sensation as such. The error lies in taking what is present in sensation to be a thing or quality existing outside the mind.

If every sensory idea possessed objective reality simply in virtue of being an idea, then the cold sensation would have to contain some OR-bearing representational content independently of the subsequent judgment. The account defended here denies that content to the sensation itself: phenomenal coolness is formally present, and the further attribution of an external quality belongs to the uptake. Mere uncertainty about what corresponds to the sensation in a body is not the ground of that denial. The ground is the distinction between sensory presentation and strict internal representation.

This also explains why sensations can be useful natural signs without containing OR-bearing representations of secondary qualities. A sensation may be lawfully caused by bodily states and may guide the embodied mind in preserving the mind-body union. But lawful causal connection and practical signification do not amount to objective reality. Objective reality is the mode of being of a represented content in a strict idea. A sensory sign can present phenomenal character and occasion judgment without containing an OR-bearing internal representation of color, heat, cold, taste, or pain as an external quality. See section §4, “Sensations, Signs, and Representation” in my DTOI & Non-DTOI Baselines for AI Models and Anna Ortín Nadal’s, “Descartes on Natural Signs and the Case of Sensory Perception,” Journal of Modern Philosophy 6 (2024): 77–87, whose stated project is precisely to defend natural signs as a genuine component of Descartes’s considered theory of sensory perception. 

Material Falsity Does Not Support Universal Objective Reality

Material falsity is often thought to create a problem for the strict-idea restriction. If the relevant Third Meditation ideas are strict tanquam rerum imagines, how can Descartes then introduce ideas that present non-things as if they were things? His phrase is: “cùm non rem tanquam rem repraesentant.” [when they present a non-thing as if a thing] (AT VII 43; CSM II 30) The immediate purpose of this section is defensive: to show that material falsity supplies no argument against the absence of objective reality in the relevant sensations. The positive account has already distinguished formally occurring phenomenal character from an item possessing objective being. The question here is whether Descartes’s formulation requires overturning that distinction, or instead marks a case in which phenomenal presentation supplies the occasion for taking what is presented as if it were a thing.

It may be objected that repraesentant itself implies a representatum, and therefore that the sensation must contain OR-bearing representational content. That is the strongest textual pressure the universalist can apply to this sentence, and it should be answered in stages rather than by a single lexical observation.

The first stage concerns the verb. The objection assumes that repraesentare must carry the strong sense in which a representation stands for something distinct from itself, so that whenever Descartes says that an idea repraesentat, some represented item must thereby possess objective being in the intellect. But the occurrence of the verb does not by itself establish that conclusion. Descartes can use representational vocabulary in contexts concerned with what is presented or exhibited to the mind, and the philosophical question is precisely what ontological commitment that presentation carries in the particular passage. The lexical possibility of a presentational reading therefore opens the question but does not decide it. Which reading applies at AT VII 43 must be determined from Descartes’s treatment of the same case.

The second stage is the opponent’s stronger reply. Even if repraesentare can have a presentational use, non rem tanquam rem might still describe an unsuccessful representational attempt: the idea purports to represent something as a thing although what it purports to represent is not in fact a thing. On such a reading, material falsity would remain a species of representation, and the universalist could argue that some representational content must therefore be present even where its purported object is defective, confused, or nonexistent. The grammar of AT VII 43 alone does not exclude that interpretation. But neither does it establish the further conclusion the universalist requires: that a determinate positive item thereby possesses objective being in the intellect and falls within the objective-reality hierarchy of AT VII 40–42.

The third stage therefore turns to Descartes’s diagnosis when he returns to the same case in the Fourth Replies. Because the idea is obscure and confused, Descartes says that he cannot determine whether it exhibits something positive outside the sensation: “propter hoc tantùm . . . quod, cùm sit obscura & confusa, non possim dijudicare an mihi quid exhibeat quod extra sensum meum sit positivum, necne.” [for this reason only . . . that, since it is obscure and confused, I cannot determine whether it exhibits to me something that is positive outside my sensation, or not] (AT VII 234; CSM II 163–64) The important point is not that unsuccessful representation is impossible. It is that Descartes does not here identify a determinate positive quality that the sensation represents incorrectly. He leaves open whether anything positive outside the sensation is exhibited at all. That uncertainty does not prove the absence of objective reality, but it prevents treating this passage as itself identifying the positive represented item required by the universalist.

The immediately preceding discussion reinforces that point. On the supposition that cold is merely a privation, Descartes denies that the idea of cold is cold itself objectively in the intellect and identifies what is positively present instead as a sensation: “si frigus sit tantùm privatio, frigoris idea non est frigus ipsum, prout est objective in intellectu, sed aliud quid quod perperam pro istâ privatione sumitur; nempe est sensus quidam nullum habens esse extra intellectum.” [if cold is only a privation, the idea of cold is not cold itself as it is objectively in the intellect, but something else that is wrongly taken for that privation, namely a certain sensation having no being outside the intellect] (AT VII 233; CSM II 163) This does not by itself prove that no aspect of the cognition could ever be assigned objective reality. It does show that the positive item Descartes identifies in the case is the sensation itself and that the text does not give us cold as a positive extra-sensory quality standing objectively in the intellect.

Read in that light, AT VII 43 need not say that these ideas contain the objective reality of a non-thing. The phrase tanquam rem (as if a thing) can instead mark the way phenomenal content supplies the basis for subsequently taking what is presented as a positive thing. Phenomenal coolness is positive as a formally real feature of the sensory mode. What does not follow is that the sensation thereby contains an OR-bearing internal representation of a positive cold-quality in bodies. The later text locates the occasion for the taking-as in the obscurity of the sensation: “obscuritas verò, quæ sola mihi dat occasionem judicandi istam ideam sensûs frigoris . . . ” [but the obscurity, which alone gives me occasion for judging that idea of the sensation of cold . . . ] (AT VII 234–35; CSM II 164) The obscurity occasions the judgment that takes phenomenal cold as indicative of a positive external quality; it does not itself establish a second representatum already contained in the sensation.

Locating the “as if” partly in the intellectual uptake does not surrender material falsity to the judgment alone. Descartes states that the idea is made materially false “non . . . ab aliquo ente positivo, sed a solâ obscuritate, quæ tamen ens aliquod positivum habet pro subjecto, nempe sensum ipsum.” [not . . . by some positive being, but by obscurity alone, which nevertheless has some positive being as its subject, namely the sensation itself] (AT VII 234; CSM II 163–64) Material falsity therefore remains grounded in a feature of the sensory idea itself: its obscurity. The positive basis of that obscurity is the formally real sensation. What the account does not require is an extra-sensory OR-bearing representatum corresponding to the supposed positive quality.

This distinction also prevents an equivocation between the formal reality of the sensation and the alleged objective reality of what it presents. The sensation is unquestionably something positive as a mental occurrence. Phenomenal coolness belongs to that formally real sensory mode. But the existence of a positive mental mode does not entail that the mode contains a second item possessing objective being. Performing or undergoing a sensory modification is not thereby representing that modification, and phenomenally presenting coolness is not thereby objectively representing a positive quality of cold in a body.

The universal-objective-reality reading therefore bears a substantial explanatory burden. If every sensory idea possesses objective reality simply in virtue of being an idea, then the materially false cold sensation must contain some OR-bearing representational content independently of the later judgment. The universalist must identify that content, explain what its representatum is, and show how its degree of objective reality enters the hierarchy used by the causal proof. The material-falsity passages do not themselves supply those answers. What Descartes expressly identifies as positive in the difficult case is the sensation, while what remains undetermined is whether it exhibits anything positive outside the sensation.

Material falsity therefore does not overturn the distinction between phenomenal presentation and objective representation. A materially false sensory idea presents positive phenomenal content and, through its obscurity, supplies the basis for taking that content as if it revealed a positive quality outside the mind. Neither the language of presenting a non-thing as a thing nor the positivity of the sensory occurrence establishes an OR-bearing representatum within the sensation. The case therefore does not establish that every idea has OR. This defensive result is consistent with, but distinct from, the positive argument already given that the relevant sensory character occurs formally rather than objectively.⁶In support, see “What Makes an Idea Materially False in Descartes’s Theory of Ideas?: Why Mere Error-Causation Is Insufficient, Why the Three Main Cases Form an Analogical Unity, and Why Hoffman Mislocates the Relevant Non-Thing with ChatGPT 5.4 Thinking” and “ChatGPT 4.5 (February 2025) defends material false sensations lack objectively real representational content.”

This permits a more exact formulation of the strict-idea thesis. Strict ideas, considered insofar as they genuinely represent something, contain objective reality corresponding to what they represent. Materially false sensory ideas need not therefore be treated as defective strict ideas that somehow possess objective reality of rank zero. They are better understood as broad-sense ideas: formally real sensory modes whose positive phenomenal content can be presented without thereby constituting an OR-bearing internal representation of the supposed external quality. Their obscurity supplies the occasion for the mind to construe what is phenomenally present as being of something outside the sensation. The universal reading therefore turns material falsity into evidence for a thesis that Descartes’s own later diagnosis gives us no independent reason to accept.

Conclusions

The argument establishes two distinct conclusions about the universal-objective-reality thesis. First, AT VII 42 does not establish it. The Third Meditation’s taxonomy and the causal comparison support reading the “by their very nature” sentence as concerning ideas under objective consideration. The demonstrative iste maintains continuity with that discussion, but does not independently determine the extension of “ideas.” The attribution of objective being by nature to strict ideas therefore supplies no sufficient ground for extending it to every broad idea.

Second, the unrestricted thesis is false on the interpretation defended here. The independent arguments identify broad ideas that genuinely lack objective reality. Common notions provide the principal case; the qualified idea of nothing corroborates it; and secondary quality sensations supply a further case through the distinction between formally occurring phenomenal character and objectively represented content. This conclusion is not inferred merely from the failure of the universalist’s reading of AT VII 42. It rests on the separate analyses of those kinds of thought.⁷See also “Condensation: Why Objective Reality Cannot Be Descartes’s Theory Of Thought: Burman, Common Notions, And The Failure Of The Strict Idea Model,” the complete uncondensed version “Why Objective Reality Cannot Be Descartes’s Universal Theory Of Thought: Burman, Common Notions, And The Failure Of The Strict-Idea Model,” and “Why Objective Reality Cannot Be Universal In Descartes’s Theory Of Ideas: Nothing, Eternal Truths, Sensations, And Fear With Claude Opus 4.6.”

The conclusion does not require settling whether every conscious episode includes some accompanying strict idea or whether complex cognition should be analyzed compositionally rather than aspectually. Objective reality belonging to an accompanying strict idea does not thereby belong to the broad idea under examination. Neither accompaniment nor association supplies objective reality to an idea that lacks it. A distinct issue concerns aspects of one cognition: distinguishing those aspects does not by itself establish which possess objective reality. That attribution must be justified by identifying the represented content, if any, rather than by appealing to objective reality elsewhere in the episode. The absence of objective reality in the cases defended here is therefore argued from their respective contents, principally through the common notions and then through the idea of nothing and sensations.

Descartes’s statement that objective being belongs to ideas by their very nature should therefore be accepted rather than weakened. Its scope, however, must be supplied by the Third Meditation argument in which it occurs. The ideas under consideration are ideas taken with respect to their representational character, the tanquam rerum imagines for which differences in objective reality become relevant to the causal proof. The statement that objective being belongs to such ideas by their nature therefore does not establish that every conscious mode Descartes may elsewhere call an idea contains objective reality.

The resulting interpretation should therefore be content-sensitive rather than merely episodic. The governing question is not whether a cognition is called an “idea,” nor even whether some objective reality occurs somewhere within the episode, but which content within the cognition, if any, is OR-bearing? Where a cognition contains a strict internal representation of a representatum, objective reality belongs to that representational content. Where a cognition instead contains volitional, affective, sensory, negative, or rule-like content without such a representatum, its formal reality as a mental occurrence does not by itself generate objective reality. This preserves the causal proof without extending its ontology beyond the representational content to which its ranking structure applies.

That reading also preserves the major textual distinctions developed throughout the argument: the taxonomy of thoughts at AT VII 37, the quatenus contrast at AT VII 40, the demonstrative iste at AT VII 42, the strict/broad distinction reported in the Conversation with Burman, the treatment of common notions and the idea of nothing, and the distinction between phenomenal presentation and objective representation in sensation and material falsity. The “by their very nature” passage remains true and important. It does not establish universal objective reality, and the independent counterexamples give a positive reason to reject that universal thesis.

For the underlying taxonomy presupposed throughout, see “Strict and Broad Ideas in DTOI.”

NOTES

(Hyperlinks below are underlined)

• 1
  See my posts arguing the falsity of the universal readings: “Do Cartesian Sensations Have Objective Reality?: Strict Ideas, Broad Ideas, And Material Falsity In Descartes’s Theory Of Ideas,” “Condensation: Why Objective Reality Cannot Be Descartes’s Theory Of Thought: Burman, Common Notions, And The Failure Of The Strict Idea Model,” its companion piece “Why Objective Reality Cannot Be Universal In Descartes’s Theory Of Ideas: Nothing, Eternal Truths, Sensations, And Fear With Claude Opus 4.6,” and “The Core DTOI Argument: Sensations Without Cartesian Objective Reality.”
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• 2
  Smith in his “Descartes’ Theory of Ideas,” Stanford Encyclopedia of Philosophy, “2. Ideas and The Formal-Objective Reality Distinction,” 3rd paragraph and final paragraph in “5. The Rules: Simple Natures and the Concepts of Clarity and Distinctness.”
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• 3
  Steven Nadler, “The Doctrine of Ideas,” in The Blackwell Guide to Descartes’ Meditations, Stephen Gaukroger, ed., (Malden, MA: Blackwell, 2006), 93.
  
  For a comparative placement of this reading among other commentators, see my “A Hyperlinked Pictorial Table of Cartesian Commentators on the Objective Reality Contents of Secondary Quality Sensations.”
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• 4
  In both clauses, quatenus means “insofar as,” “to the extent that,” or “considered under the aspect that.” It marks two respects of the same ideas already under discussion, not two classes of ideas. The construction functions much like a distinction secundum rationem: a distinction according to the aspect under which something is conceived, without by itself requiring a real distinction between two things. The second clause itself concerns ideas that do represent one thing rather than another; it therefore should not be generalized into the separate thesis that every broad-sense cognition necessarily has a representational aspect.
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• 5
  Read in isolation, “iste modus essendi objectivus competit ideis ex ipsarum naturâ” naturally sounds universal. AT VII 42 does not by itself prove that ideis ranges only over ideas considered under their representational aspect, and it does not by itself establish that some Cartesian ideas lack objective reality. The surrounding argument prevents treating the unrestricted scope as already established by the isolated wording. The inference from “this objective mode of being belongs to ideas by their very nature” to “every Cartesian idea whatsoever has objective reality by its very nature” requires an additional premise: that ideis at AT VII 42 ranges over every item Descartes calls an idea in any sense, rather than over the ideas already being considered quatenus . . . repraesentat. The passage itself does not supply that unrestricted quantifier. The independent case against the universal thesis comes later, chiefly from common notions, with the idea of nothing and cold sensation supplying corroborating and independent pressure. The burden of proof falls upon the universalist to show the unrestricted range.
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• 6
  In support, see “What Makes an Idea Materially False in Descartes’s Theory of Ideas?: Why Mere Error-Causation Is Insufficient, Why the Three Main Cases Form an Analogical Unity, and Why Hoffman Mislocates the Relevant Non-Thing with ChatGPT 5.4 Thinking” and “ChatGPT 4.5 (February 2025) defends material false sensations lack objectively real representational content.” ↩︎
• 7
  See also “Condensation: Why Objective Reality Cannot Be Descartes’s Theory Of Thought: Burman, Common Notions, And The Failure Of The Strict Idea Model,” the complete uncondensed version “Why Objective Reality Cannot Be Descartes’s Universal Theory Of Thought: Burman, Common Notions, And The Failure Of The Strict-Idea Model,” and “Why Objective Reality Cannot Be Universal In Descartes’s Theory Of Ideas: Nothing, Eternal Truths, Sensations, And Fear With Claude Opus 4.6.” ↩︎