Lecture Supplement on Descartes’ “Second Meditation:"
Copyright © 2018 Bruce W. 
Hauptli 
63 Doubt...until I shall find something that is
certain. 
63-64 The Cogito. 
-Cf., Descartes’ Discourse On 
Method.[1] 
-What of “I walk therefore I am a 
body with legs?”[2] 
-What if Hamlet says “I think 
therefore I am”?  
-What of Jorge Luis Borges’ “The Circular Ruins,”[3] or Lewis Carroll’s Alice in Wonderland and Through the Looking-Glass?[4]
-Discuss the difference between 
the “occurrent “and the “substantial” 
senses of ‘I.’  Indicate why the 
distinction is important here, and why it is the “substantial” sense which 
Descartes wants and needs (but doesn’t seem entitled to). 
--Memory and the occurrent 
conception of the self: Christopher Nolen’s movie
Memento [2000]—without short-term memory, we get a very different 
“self!”  Of course there is also 
“long-term” memory, and other sorts!  
Moreover, does memory entail any sort of certainty? 
--identity and Theseus’ ship—my 
“updated case would have one imagine a ship (Theseus’) which is rebuilt plank by 
plank (with the original planks saved and then reassembled according to the 
original plan.  The question is: 
“Which of the resultant ships is Theseus’ ship?” 
-Nonetheless, Descartes concludes 
that he knows he is an enduring thing—a 
substance:
--“For it is so obvious that it 
is I who doubt, I who understand, and I who will, that there is nothing by which 
it could be explained more clearly.  
But indeed it is also the same “I” who imagines; for although perhaps, as I 
supposed before, absolutely noting that I imagined is true, still the very power 
of imagining really does exist, and constitutes a part of my thought. 
Finally, it is this same “I” who senses or who is cognizant of bodily 
things as if through the senses….”  
-Indubitability—three senses: psychological, logical, metaphysical: 
“psychological” certainty would be where a 
specific individual finds herself unable to raise doubts (because of her 
psychological constitution, or her deeply felt convictions, or her 
predispositions, etc.); “logical” certainty would be where
no individual could raise doubts (because logic rules them out); and 
“metaphysical” certainty would be where 
absolutely no doubts could be raised (where error is absolutely 
inconceivable).  “While we thus 
reject all that of which we can possibly doubt, and feign that it is false...we 
cannot in the same way conceive that we who doubt these things are not; for 
there is a contradiction in conceiving that what thinks does not at the same 
time as it thinks, exist.”[5] 
--Descartes asks “Do I exist?” 
The American philosopher, Morris Cohen, asks “Who wants to know?”[6] 
-“Everything in which there 
resides immediately, as in a subject, or by means of which there exists anything 
that we perceive, i.e., any property, quality, or attribute, of which we have a 
real idea, is called a Substance; 
neither do we have any other idea of substance itself, precisely taken, than 
that it is a thing in which this something that we perceive or which is present 
objectively in some of our ideas, exists formally or eminently. 
For by means of our natural light we know that a real attribute cannot be an attribute 
of nothing.”[7] 
In his Principles of Philosophy, 
Descartes defines ‘substance’ more carefully (and this is taken as
the Cartesian definition) as follows: 
“by substance, we can understand nothing else than a thing which so exists that 
it needs no other thing in order to exist. 
And in fact only one single substance can be understood which clearly 
needs nothing else, namely God.  We 
perceive that all other things can exist only by the help of the concourse of 
God.  That is why the word substance 
does not pertain univoce to God and to other things, as they say in the Schools, that 
is, no common signification for this appellation which will apply equally to God 
and to them can be distinctly understood.”[8] 
--Discuss the notion of 
the “natural light.”  What guarantees 
the truth of the “dictates” of the natural light?[9] 
-In his City of 
65-66 Sum Res Cogitans. 
But I do not yet know with sufficient clearness what I am, though assured 
that I am.  What, then, did I 
formerly think I was?  
-A “rational animal”—this leaves us with two questions to answer (“What 
is rationality?” and “What is an animal?”) and we have no way of getting started 
here.  
-64 Body: 
--Discuss the notion of an essential 
characteristic—Descartes is endeavoring to discover what he is “essentially.”[10] 
-65 Soul: nutrition, walking (locomotion), perception? 
-Thinking:....I am a thinking 
thing.  
-“...in the strict sense the knowledge of this “I” 
does not depend upon things of whose existence I do not yet have knowledge.” 
-Is this the case? 
--What right has he to
a thing (a single substance)? 
--What right has he to claim that he is a thing (a 
substance)?  
--Memory, “occurrent self-identity,” and Theseus’ 
ship—my “updated case would have one imagine a ship (Theseus’) which is rebuilt 
plank by plank (with the original planks saved and then reassembled according to 
the original plan.  The question is: 
“Which of the resultant ships is Theseus’ ship?” 
--The 2000 movie
Memento directed by Christopher Nolan 
is worth viewing and considering in the context of our discussions here. 
The movie centers on the trials undergone by a character who lacks the 
form of “short-term” memory which allows us to have plans for the future or 
remember what we did recently.  While 
he can speak language, drive cars, and interact with the world, he can not 
remember whether he is chasing someone or being chased, who he is, or what he is 
doing.  While he writes and even 
tattoos notes to himself, he has to try and fight against his lack of memory to 
understand what is going on in “his life.” 
-“And when I stated that this proposition
I think, therefore I am is the first 
and most certain which presents itself to those who philosophize in orderly 
fashion, I did not for all that deny that we must first of all know
what is knowledge, what is existence, 
and what is certainty, and that
in order to think we must be, and such 
like; but because these are notions of the simplest possible kind, which of 
themselves give us no knowledge of anything that exists, I did not think them 
worthy of being put on record.”[11] 
66 A thing which thinks is a thing which
understands, affirms, denies, wills, refuses, imagines, and perceives. 
-“For it is so obvious that it is I who doubt, I 
who understand, and I who desire, that there is nothing by which it could be 
explained more clearly.  But indeed 
it is also the same “I” who imagines; for although perhaps, as I supposed 
before, absolutely nothing that I imagined is true, still the very power of 
imagining really does exist, and constitutes a part of my thought. 
Finally, it is this same “I” who senses or who is cognizant of bodily 
things as if through the senses.  For 
example, I now I see a light, I hear a noise, and I feel heat. 
These things are false, since I am asleep. 
Yet I certainly do seem to see, hear, and feel warmth. 
This cannot be false.  
Properly speaking, this is what in me is called “sensing.” 
But this, precisely so taken, is nothing other than thinking.” 
-Note: if this is what he has discovered with the
cogito, then it is fairly clear that 
he has the “substantial” conception of the self in mind—few can undertake this 
many complex cognitive tasks all at the same time! 
No “occurrent” self would be able to “understand, affirm, deny, will, 
refuse, imagine, and perceive” all at once! 
-Note: In his On the Equality 
of the Two Sexes [1673, anonymously], Francois Poullain de la Barre 
maintains that: 
it is easy to see that the difference between the two sexes 
is limited to the body, since that is the only part used in the reproduction of 
humankind.  Since the mind merely 
gives its consent, and does so in exactly the same way in everyone, we can 
conclude that it has no sex.  
  Considered 
independently, the mind is found to be equal and of the same nature in all men, 
and capable of all kinds of thoughts. 
It is as much exercised by small concepts as by large; as much thought is 
required to conceive of a mite as an elephant….Since there seems not to be any 
greater difference between the minds of the two sexes, we can say that the 
difference does not lie there.  It is 
rather the constitution of the body, but particularly education, religious 
observance, and the effects of our environment which are the natural and 
perceptible causes of all the many differences between people. 
  A woman’s mind 
is joined to her body, like a man’s, by God himself, and according to the same 
laws.  Feelings, passions, and the 
will maintain this union, and since the mind functions no differently in one sex 
than in the other, it is capable of the same things in both.[12] 
67 The Wax Experiment: the wax is something
extended.  Here Descartes 
lets his mind “wander” and, clearly, stops, for the moment, adducing claims to 
certain knowledge.  In this passage 
he clarifies the essential characteristic of non-mental substance (the physical 
realm of corporeal things)—shape, divisibility, occupation of space, having 
location, etc.  The background 
picture of the physical is provided by the emerging science of the day—by 
Galileo’s “mechanics.”  
-68 Descartes claims that he knows the wax by his 
reason—not by the use of his senses or of his imagination! 
-69 “Each time I know the wax, I know myself better 
(than I know the wax).”  
“...I manifestly know that nothing can be perceived more 
easily and more evidently than my own mind.” 
Critical Comments on 
the Second Meditation: 
(A). Attributes without substances? 
Substances without attributes? 
Modes?  
Bernard Williams notes that “a mode presupposes 
its attribute, but equally an attribute which is really present implies the 
presence of a mode—a thing can not be extended without being extended in one way rather 
than another.”[13] 
In his Descartes, Spinoza, Leibniz: The Concept of Substance in 
Seventeenth-Century Metaphysics, R.S. Woolhouse maintains that: “but even if 
modes and accidents need substances, don’t substances also require modes? 
Can we, as Descartes says, ‘clearly perceive a substance apart from the 
mode which we say differs from it’?  
Descartes’s point here is merely that substances do not require the particular 
modes that they happen to have.  It 
is not that they do not require some modes or other. 
It is clear that they do; for modes are accidental variations of an 
attribute, and the distinction between a substance and at least some of its 
attributes is so close as to be ‘merely a conceptual one’. 
One substance can exist apart from another; it can exist apart from the 
particular modes it happens to have; but it cannot exist with no modes, for 
there are certain attributes without which substances are ‘unintelligible’. 
For many substances the attribute of extension (the attribute of being 
spatially dimensioned or of having length, breadth, and depth) is one such. 
Though a given substance is intelligible without the particular modal 
shape it has, it will be unintelligible with no shape at all, for it is 
unintelligible apart from the attribute of extension.”[14] 
(B). Descartes’ goal is the validation of reason, but isn’t 
any such attempt question-begging? 
(C). Does Descartes 
prove that the mind and the body are different? 
(D). Multiple personalities and the
cogito.  
(E). We need to discuss what sort of claim Descartes makes 
with his cogito—is it (A) an
inference, (B) an
intuition, or, finally, (c) is
an epistemic interpretation of the
cogito the right way to see it?[15] 
(i) if the cogito is an inference, 
it must look something like this: 
(a) I think. 
    
Whatever thinks exists.  
    
Therefore, I exist.  
(b) Note, however, that
if Descartes is presenting us with an 
inference, the conclusion can not be the 
first thing he is certain of—the premises themselves become the first 
certainties (or else, they are themselves in need of justification). 
(c) Moreover, the universal premise may be 
questioned—especially if the evil genius hypothesis and the dreaming argument 
are considered.  
(d) Also, if the premises are certain, there is still the 
question of whether or not Descartes (or ourselves) might be deceived regarding 
the validity of the inference.  
Surely the evil genius could mislead us as we consider a complex inference. 
(f) Furthermore, we should note that the inference might 
not in fact hold.  Consider the 
following comment by Bertrand Russell: “let us begin by examining Descartes’ 
view.  “I think, therefore I am” is 
what he says, but this won’t do as it stands. 
What, from his point of view, he should profess to know is not “I think,” 
but “There is thinking”....He would say that thoughts imply a thinker. 
But why should they?  Why 
should not a thinker be simply a certain series of thoughts, connected with each 
other by causal laws?”[16] 
(g) Finally (in regard to the inference interpretation), we 
should note that Spinoza raised an important objection to Descartes’ “argument.” 
Feldman clarifies Spinoza’s objection as follows:
I am convinced that you could not come to know that you had 
a headache by the use of [a similar] argument [similar, that is, to the
cogito]. 
The problem is not that the argument itself is defective....you would 
undoubtedly know that you have a headache before you could go through the 
various steps of the argument.  
Furthermore, you would already be so certain that you have a headache that you 
could not increase your certainty by the use of this argument. 
Your knowledge that you have a headache would be more direct. 
The headache itself is all the evidence you need for the conclusion that 
you have a headache.  
  As I 
understand him, Spinoza wants to make something like this point concerning the 
Cogito argument.  Perhaps there is 
nothing wrong with the argument itself. 
The problem is that Descartes could not have used that argument to come 
to know that he exists.  He 
undoubtedly knew that he existed before he made use of that (or any other) 
argument.  His knowledge of his own 
existence could not have been dependent upon any premises.
 He knows immediately, and without 
evidence, that he existed.[17] 
(ii) if the cogito is an intuition, 
there are still problems (there are places in Descartes’ works where the 
intuition interpretation is warranted: “by 
intuition I understand, not the fluctuating testimony of the senses, nor the 
misleading judgment that proceeds from the blundering constructions of 
imagination, but the conception which an unclouded and attentive mind gives us 
so readily and distinctly that we are wholly freed from doubt about that which 
we understand.  Or, what comes to the 
same thing, intuition is the 
undoubting conception of an unclouded and attentive mind, and springs from the 
light of reason alone; it is more certain than deduction itself in that it is 
simpler, though deduction, as we have noted above, cannot by us be erroneously 
conducted.  Thus each individual can 
mentally have intuition of the fact that he exists, and that he thinks; that the 
triangle is bounded by three lines only....”[18] 
The main problem, of course, is that
intuiting something does not seem to grant 
it metaphysical certainty [or truth]. 
(iii) the “epistemic” interpretation of the
cogito treats the “argument” as neither an inference nor as an 
intuition but, rather, as an “epistemic discovery.” 
As Feldman says, “this belief is metaphysically certain, not because it 
has been derived from indubitable premises, and not because it has been 
intuited.  Rather,
it is metaphysically certain simply 
because there is no reason to doubt it.”[19] 
This, of course, suggests a view the
Meditations which would have Descartes 
seeking to find claims which we can not doubt, but which need not be
metaphysically certain. 
This sort of interpretation avoids some of the problems which Descartes 
encounters on the other interpretations of the
cogito, but it is inconsistent with 
other things which he says.  Besides 
this, the basic problem with this sort of interpretation is with the claim that 
there is no reason for 
doubting—establishing that the reasons for doubting adduced thus far do not 
provide such a rationale for doubt does not establish that there is no reason 
for doubt—just that such a reason for doubting has
not yet arisen!  
(F). In his Sophie’s 
World: A Novel About the History of Philosophy, Jostein Gaarder suggests 
that when thinking of Descartes sum res 
cogitans, one remember Sartre’s “existence takes priority over essence.” 
As he notes that: “throughout the entire history of philosophy, 
philosophers have sought to discover what man is—or what human nature is. 
But Sartre believed that man has no such eternal “nature” to fall back 
on.  It is therefore useless to 
search for the meaning of life in general. 
We are condemned to improvise. 
We are like actors dragged onto the stage without having learned our 
lines, with no script and no prompter to whisper stage directions to us. 
We must decide for ourselves how to live.”[20] 
(G). In his Tragic 
Sense of Life, Miguel de Unamuno offers the following critique of Descartes: 
“the defect of Descartes’ Discourse on 
Method lies in his resolution to empty himself of himself, of Descartes, of 
the real man, the man of flesh and bone, the man who does not want to die, in 
order that he might be a mere thinker—that is, an abstraction. 
But the real man returned and thrust himself into his philosophy.... 
  The truth is 
sum, ergo cogito—I am, therefore I think, although not everything that is 
thinks.  Is not conscious thinking 
above all consciousness of being?  Is 
pure thought possible, without consciousness of self, without personality?”[21] 
Some Questions on 
Meditations I and II: 
(A). What right of his to the statement that he is a 
thinking substance?  
(B). What of his right to talk in terms of the 
substance-attribute distinction at all? 
(C). What of his right to talk about a
continuous substance—the problem of multiple selves? 
(D). What of the other propositions he accepts as certain 
in the argument for the cogito? 
(F). If you are negative on these points, where does it 
leave you?  
Preparation for the 
Third Meditation: 
Part IV of Descartes’ 
Discourse on Method[22] 
(pp. 18-23 of our text) provides an excellent (and brief) summary of the 
argument of the Meditations (both up 
to this point and through the rest).  
It may be a good idea to read it at this point. 
As I noted above, Descartes’ deity is a philosophical deity![23] 
We should contrast this sort of conception with Pascal’s “personalistic” 
deity, for example.  
This Meditation involves “building 
a bridge” from the “subjective world” of the self to the “objective 
world”—that which is “beyond” the self. 
Note: the evil genius may be considered to be the 
“troll” under the bridge!  
He seeks the identification of a characteristic of some 
ideas which assures that they [truly] 
represent.  
(A). Dark Pool 
Analogy: if you are swimming alone in a dark pool and you feel something 
brush your leg, it is natural to reach the (alarming) conclusion that you are 
not alone.  
(B). The “anthropology 
example“:[24] find a 
tribe that has a picture of a pile of stones and a picture of a complex machine: 
tells us something about the level of development of the 
tribe.  They must have such machines 
of the imagination necessary to conceive of them. 
Higher order understanding exhibited by the second picture. 
degrees of reality and how this applies to ideas. 
objective reality of an idea → the
referential content the idea. 
(C). The “Causal 
Principle” and “Ideas:” 
ex nihilo nihil fit 
(Descartes believes it and the principle are equivalent) and, it is important to 
note, he will be applying this principle to
ideas in his argument.  
Aristotelian analysis of causation: the efficient cause 
explains the existence of a thing, while the formal cause explains the nature of 
that thing.  
(D). Causation 
without transfer—think of force 
and of deduction: 
Cause, reason, and explanation. 
Together the causal principle, the idea of the
degrees of reality of ideas (objective 
reality), his idea of a deity, and his certainty that he does not have the 
power to cause this idea yield the proof that this deity exists! 
Notes: [click on note number to return to the 
text for the note].  This 
								supplement, and the others for Descartes’
								
								Meditations on First Philosophy, reference 
								the pages in Donald A. Cress’ translation in
								René 
								Descartes: Discourse on Method and Meditations 
								on First Philosophy, Fourth Edition 
								(Indianapolis: Hackett, 1998
								
								
								
								[1]
								Cf., 
								Rene Descartes,
								Discourse 
								on the Method for Rightly Conducting One’s 
								Reason and for Seeking Truth in the Sciences 
								[1637], trans. Donald A. Cress, in
								Discourse 
								on Method and Meditations on First Philosophy, 
								trans. Donald A. Cress (fourth edition) 
								(Indianapolis: Hackett, 1998), p. 18. 
								
								
								
								
								[2]
								Cf., 
								Descartes,
								Principles of Philosophy [1644] I 9, in
								The Philosophical Works of Descartes v. 1 [1911], trans. E.S. 
								Haldane and G.R.T Ross (Cambridge: Cambridge 
								U.P., 1969), p. 222. 
								
								
								
								
								[3]
								Cf., 
								Jorge Luis Borges, “The Circular Ruins,”
								op. cit. 
								
								
								
								
								[4]
								Cf.,
								The 
								Annotated 
								
								
								
								[5] Descartes,
								Principles 
								of Philosophy, op. cit., I 7, p. 221. 
								
								
								
								
								[6] Cited in Avrum 
								Stroll and Richard Popkin,
								
								Introduction to Philosophy (N.Y.: Holt 
								Rinehart, 1972) (second edition), p. 44. 
								
								
								
								
								[7] Rene Descartes, 
								“Arguments Demonstrating the Existence of God 
								and the Distinction Between Soul and Body, Drawn 
								Up In Geometrical Fashion,” published as part of 
								the “Objections and Replies” in 1641 with the
								Meditations, in The 
								Philosophical Works of Descartes v. 2,
								op. cit., 
								p. 53. 
								
								
								
								
								[8] Descartes,
								Principles 
								of Philosophy I 51,
								op. cit., 
								pp. 239-240. 
								
								
								
								
								[9]
								Cf., 
								John Morris, “Descartes’ Natural Light,”
								Journal of 
								the History of Philosophy v. 11 (1973), pp. 
								169-187. 
								
								
								
								
								[10] Note that the 
								question “What is the
								essential 
								characteristic of a knife?” presumes that there 
								is an essential characteristic of knives. 
								Aristotle makes such an assumption, and 
								assumes that the essence of knives is “to cut 
								well.” 
								Those of us who live in a “peanut butter 
								age” might maintain that knives have a variety 
								of functions and that there is no one of them 
								which is essential. 
								Similarly, one might contend, there might 
								be a variety of characteristics which are 
								relevant when Descartes’ question is asked 
								regarding the self. 
								
								
								
								
								[11] Descartes,
								Principles 
								of Philosophy, op. cit., I 10, p. 222. 
								Note that he here allows that there are 
								things which need to be known prior to the
								cogito. 
								Does this undercut his argument in any 
								way?  
								
								
								
								[12] Francois 
								Poullain de la Barre,
								On the 
								Equality of the Two Sexes [1673, 
								anonymously], in
								Francois Poullian de la Barre: Three Cartesian Feminist Treatises, 
								ed. Marcelle Welch, trans. Vivian Bosley (
								
								
								
								[13] Bernard 
								Williams, 
								Descartes:
								The 
								Project of Pure Enquiry (Harmonsworth: 
								Penguin, 1978), p. 125. 
								Cf., 
								pp. 124-129. 
								
								
								
								
								[14] R.S. Woolhouse,
								Descartes, 
								Spinoza, Leibniz: The Concept of Substance in 
								Seventeenth-Century Metaphysics (London: 
								Routledge, 1993), pp. 18-19. 
								
								
								
								
								[15] The discussion 
								of the status of the
								cogito 
								which follows is largely lifted from Fred 
								Feldman, A Cartesian Introduction to Philosophy (New York: McGraw-Hill, 
								1986). 
								
								
								
								
								[16] Bertrand 
								Russell, 
								An Outline of Philosophy (London: George 
								Allen and Unwin, 1927), p. 7. 
								With this objection Russell is bringing 
								to bear the distinction we raised earlier 
								regarding the difference between the occurrent 
								and substantial conception of the self. 
								The question here is: what entitles 
								Descartes to assume that there is anything more 
								than the mere occurrence of thinking? 
								
								
								
								
								[17] Fred Feldman,
								A 
								Cartesian Introduction to Philosophy, op. cit, 
								p. 66. 
								
								
								
								
								[18] Rene Descartes,
								Rules For 
								the Direction of the Mind [posthumous, 
								1628], in 
								The Philosophical Works of Descartes, v. 1,
								op. cit., 
								p. 7. 
								
								
								
								
								[19]
								Ibid., 
								p. 70. 
								
								
								
								
								[20] Jostein 
								Gaarder, 
								Sophie’s World: A Novel About the History of 
								Philosophy, trans. Paulette Moller (N.Y.: 
								Farr, Straus and Giroux, 1994), p. 350. 
								
								
								
								
								[21] Miguel de 
								Unamuno, 
								Tragic Sense of Life, trans. C.J. Flitch 
								(N.Y.: Macmillan, 1921), p. 34. 
								
								
								
								
								[22] Rene Descartes,
								Discourse 
								on the Method for Rightly Conducting One’s 
								Reason and for Seeking Truth in the Sciences, 
								op. cit.—Part IV is on pp. 18-23. 
								
								
								
								
								[23] For 
								clarification of the distinction between the 
								sort of deity discussed by philosophers and the 
								deity as many conceive it, cf. Anthony Kenny,
								The God of 
								the Philosophers, op. cit. 
								
[24] This example is discussed in detail in Bernard Williams, in his Descartes: The Project of Pure Enquiry, op. cit, pp. 138-142.
Email: hauptli@fiu.edu
Last revised: 04/25/18.