| 5188 | A thought doesn't imply other thoughts, or enough thoughts to make up a self [Ayer on Descartes] |
| Full Idea: The fact that a thought occurs at a given moment does not entail that any other thought has occurred at any other moment, still less that there has occurred a series of thoughts sufficient to constitute a single self. | |
| From: comment on René Descartes (Meditations [1641], §2.26) by A.J. Ayer - Language,Truth and Logic Ch.2 | |
| A reaction: This seems to be the main objection to the Cogito. It doesn't refute it, but simply recommends cautious restraint in what is being claimed as its conclusion. I can't make much sense of a thought which has no thinker at all. |
| 3623 | The Cogito only works if you already understand what thought and existence are [Mersenne on Descartes] |
| Full Idea: In order to be certain that you are thinking you must know what thought or thinking is, and what your existence is; but since you do not yet know what these things are, how can you know that you are thinking or that you exist? | |
| From: comment on René Descartes (Meditations [1641], §2.26) by Marin Mersenne - Objections to 'Meditations' (Sixth) 413 |
| 3624 | That I perform an activity (thinking) doesn't prove what type of thing I am [Hobbes on Descartes] |
| Full Idea: From the fact that I am thinking it follows that I exist, since that which thinks is not nothing. But when he adds 'that is, I am a mind, or intelligence, or intellect', a doubt arises. ..You might as well say 'I am walking, therefore I am a walk'. | |
| From: comment on René Descartes (Meditations [1641], §2.26) by Thomas Hobbes - Objections to 'Meditations' (Third) 172 |
| 3120 | Autistic children seem to use the 'I' concept without seeing themselves as thinkers [Segal on Descartes] |
| Full Idea: It really does not seem (as a result of research into autism) that when one thinks of oneself with one's 'I' concept, one must thereby represent oneself as a thinker. | |
| From: comment on René Descartes (Meditations [1641], §2.26) by Gabriel M.A. Segal - A Slim Book about Narrow Content 4.2 |
| 4526 | The Cogito assumes a priori the existence of substance, when actually it is a grammatical custom [Nietzsche on Descartes] |
| Full Idea: Descartes' Cogito posits as 'true a priori' our belief in the concept of substance, but the idea that when there is a thought there has to be something 'that thinks' is simply a formulation of our grammatical custom that adds a doer to every deed. | |
| From: comment on René Descartes (Meditations [1641], §2.26) by Friedrich Nietzsche - The Will to Power (notebooks) §484 | |
| A reaction: This anticipates the sort of thing Ayer and the logical positivists said. It is not clear that Descartes does think the mind is a substance, but this pinpoints a possible presupposition in Descartes. |
| 5579 | How can we infer that all thinking involves self-consciousness, just from my own case? [Kant on Descartes] |
| Full Idea: It seems strange that the condition under which I think is to be valid for everything that thinks, and that on an empirical-seeming proposition we can presume to ground a universal judgement, that everything that thinks has self-consciousness. | |
| From: comment on René Descartes (Meditations [1641], §2.26) by Immanuel Kant - Critique of Pure Reason A346 | |
| A reaction: Kant is not bothered by this, and says we know it a priori. If it is indeed an empirical proposition, it becomes an induction with one instance, which is the notorious weakness of the 'argument from analogy' to other minds. The Cogito is not empirical. |
| 1117 | The Cogito proves subjective experience is basic, but makes false claims about the Self [Russell on Descartes] |
| Full Idea: The Cogito argument proves that subjective experience is the most reliable, but it makes unjustified claims about the certainty of the Self. | |
| From: comment on René Descartes (Meditations [1641], §2.26) by Bertrand Russell - Problems of Philosophy Ch 2 |
| 5360 | The thing which experiences may be momentary, and change with the next experience [Russell on Descartes] |
| Full Idea: It might be that the something which sees a brown colour is quite momentary, and not the same thing which has some different experience the next moment. | |
| From: comment on René Descartes (Meditations [1641], §2.26) by Bertrand Russell - Problems of Philosophy Ch.2 | |
| A reaction: This has become one of the standard objections to the Cogito. Note that Descartes himself was aware of the problem (Idea 1400). Sometimes experiences make no sense if there isn't something connecting them to previous experiences. |
| 2870 | 'I think' assumes I exist, that thinking is known and caused, and that I am doing it [Nietzsche on Descartes] |
| Full Idea: The sentence "I think" contains a series of unprovable assertions; for example, it is I who think, that it must be something at all which thinks, that thinking is by an entity thought of as a cause, that an 'I' exists, and that I know what thinking is. | |
| From: comment on René Descartes (Meditations [1641], §2.26) by Friedrich Nietzsche - Beyond Good and Evil §16 |
| 5580 | My self is not an inference from 'I think', but a presupposition of it [Kant on Descartes] |
| Full Idea: The simplicity of my self is not inferred from the proposition "I think", but rather the former lies in every thought. 'I am simple' is an immediate apperception, just as the Cogito is tautological, since 'cogito' immediately asserts the reality. | |
| From: comment on René Descartes (Meditations [1641], §2.26) by Immanuel Kant - Critique of Pure Reason A355 | |
| A reaction: This is why Kant thinks the self is the result of a transcendental deduction, rather than of a direct observation of the self-evident. Personally I side with Descartes. I do not 'observe' my self, but I am acutely aware of its presence and actions. |
| 5587 | We cannot give any information a priori about the nature of the 'thing that thinks' [Kant on Descartes] |
| Full Idea: If anyone asks me: What is the constitution of a thing that thinks? I do not know how to answer a priori, because the answer ought to be synthetic (for an analytic answer explains thinking, but gives no cognition of that on which thinking rests). | |
| From: comment on René Descartes (Meditations [1641], §2.26) by Immanuel Kant - Critique of Pure Reason A398 | |
| A reaction: This has always seemed a problem with Descartes' very thin account of his 'res cogitans', but then what exactly does Kant want to know? Is it a metaphysical disaster if we think of the self as having no more identity than a geometrical point? |
| 5588 | The fact that I am a subject is not enough evidence to show that I am a substantial object [Kant on Descartes] |
| Full Idea: The fact that I am a subject ..does not signify that as object I am a self-subsisting being or substance; the latter goes too far, and hence demands data that are not encountered at all in thinking. | |
| From: comment on René Descartes (Meditations [1641], §2.26) by Immanuel Kant - Critique of Pure Reason B407 | |
| A reaction: This is a key problem with the Cogito - that so little can be said about the 'I' of which the existence has been proved that it is not clear that anything has been proved at all - certainly not that there is a continuous and stable Ego. |
| 1369 | It is a precondition of the use of the word 'I' that I exist [Ayer on Descartes] |
| Full Idea: In the Cogito the work is all done by the demonstrative word 'I', because it is a precondition of the use of such a word that the thing to which it points has to exist. | |
| From: comment on René Descartes (Meditations [1641], §2.26) by A.J. Ayer - The Problem of Knowledge Ch 2 (iii) |
| 2873 | Maybe 'I' am not the thinker, but something produced by thought [Nietzsche on Descartes] |
| Full Idea: In the past one said 'I' is the condition, 'think' is the predicate and conditioned - thinking is an activity which the subject causes; but maybe the reverse is true - and 'I' is only a synthesis produced by thinking. | |
| From: comment on René Descartes (Meditations [1641], §2.26) by Friedrich Nietzsche - Beyond Good and Evil §54 |
| 13923 | Descartes' claim to know his existence before his essence is misleading or absurd [Descartes, by Lowe] |
| Full Idea: Descartes claimed to know that he existed before he knew what he was - before he grasped his own essence. This is either disingenuous or intended non-literally, if it is not to be dismissed as incomprehensible. | |
| From: report of René Descartes (Meditations [1641], 2) by E.J. Lowe - Two Notions of Being: Entity and Essence 2 n32 | |
| A reaction: If something comes at you from the mist, you can know that it exists before you know what it is. How could you understand the essence of something if you hadn't first encountered its existence? Lowe has it the wrong way round. |
| 6930 | Modern self-consciousness is a doubtful abstraction; only senses and feelings are certain [Feuerbach on Descartes] |
| Full Idea: The self-consciousness of modern philosophy is only a being ideated and mediated through abstraction and thus a doubtful being; certain and immediately assured is only that which is an object of the senses, perception and feeling. | |
| From: comment on René Descartes (Meditations [1641], 2) by Ludwig Feuerbach - Principles of Philosophy of the Future §37 | |
| A reaction: This seems to agree with Hume's empirical doubts about the self (Idea 1316). The comment that 'abstraction' is involved in the Cogito argument is interesting. Descartes said the Cogito was a 'simply intuition of the mind' (Idea 3622). |
| 5638 | 'I think' is useless, because it is contingent, and limited to the first person [Spinoza, by Scruton] |
| Full Idea: The proposition 'I think' was useless to Spinoza, because it expresses a merely contingent proposition, where certainty must be founded in necessity, and because it refers to the first person, when truth comes from rising above our own mentality. | |
| From: report of Baruch de Spinoza (The Ethics [1675]) by Roger Scruton - Short History of Modern Philosophy Ch.5 | |
| A reaction: I find both of these criticisms very appealing. One might simply say that the starting point of philosophy is not the process of thinking, but the contents of thinking. Descartes' move is like astronomers becoming obsessed with telescopes. |
| 12996 | I know more than I think, since I know I think A then B then C [Leibniz] |
| Full Idea: Not only is it immediately evident to me that I think, but it is just as evident that I think various thoughts: at one time I think about A and at another about B and so on. Thus the Cartesian principle is sound, but it is not the only one of its kind. | |
| From: Gottfried Leibniz (New Essays on Human Understanding [1704], 4.02) | |
| A reaction: I don't suppose that Descartes would object to this, but he was aware that there didn't seem to be any actual introspective experience that united the various thoughts into a single thinker. Only logical connections between the thoughts does that. |
| 13003 | The Cogito doesn't prove existence, because 'I am thinking' already includes 'I am' [Leibniz] |
| Full Idea: To say 'I think therefore I am' is not really to prove existence from thought, since 'to think' and 'to be thinking' are one and the same, and to say 'I am thinking' [je suis pensant] is already to say 'I am' [je suis]. | |
| From: Gottfried Leibniz (New Essays on Human Understanding [1704], 4.07) | |
| A reaction: This is the objection which was offered by A.J. Ayer, and I take it to the one of the two principle objections to the Cogito (i.e. that it may be a tautology), along with the objection about the assumption of the continuity of the same thinker. |
| 19334 | I can't just know myself to be a substance; I must distinguish myself from others, which is hard [Leibniz] |
| Full Idea: It is not enough for understanding the nature of myself, that I feel myself to be a thinking substance, one would have to form a distinct idea of what distinguishes me from all other possible minds; but of that I have only a confused experience. | |
| From: Gottfried Leibniz (Letters to Antoine Arnauld [1686], 1686.07.4/14) | |
| A reaction: Not a criticism I have encountered before. Does he mean that I might be two minds, or might be a multitude of minds? It seems to be Hume's problem, that you are aware of experiences, but not of the substance that unites them. |
| 5590 | 'I think therefore I am' is an identity, not an inference (as there is no major premise) [Kant] |
| Full Idea: My existence cannot be regarded as inferred from the proposition "I think" (for otherwise the major premise "Everything that thinks, exists" would have to precede it), but rather it is identical with it. | |
| From: Immanuel Kant (Critique of Pure Reason [1781], B422) | |
| A reaction: "I think" can hardly be identical with "I exist". One is an activity, the other a state. I prefer: within the unified activity of thinking which is clearly occurring, it is self-evident that there must be an 'I' which holds it together. |
| 23201 | The 'I' does not think; it is a construction of thinking, like other useful abstractions [Nietzsche] |
| Full Idea: I do not grant to the metaphysicians that the 'I' is what thinks: on the contrary I take the I itself as a construction thinking, of the same rank as 'material',' thing', 'substance', 'purpose', 'number': therefore only as a regulative fiction. | |
| From: Friedrich Nietzsche (Unpublished Notebooks 1885-86 [1886], 35[35]) | |
| A reaction: Ah. I have always defended the Self, the thing that is in charge when the mind is directed to something. I suddenly see that this is compatible with the Self not being the thinker! It is just the willer, and the controller of the searchlight. Self = will? |
| 7146 | Belief in the body is better established than belief in the mind [Nietzsche] |
| Full Idea: Belief in the body is better established than belief in the mind. | |
| From: Friedrich Nietzsche (Writings from Late Notebooks [1887], 40[15]) | |
| A reaction: Compare Spinoza in Idea 4833. Hawking says he thinks better because he is largely paralysed. Externalism about mind makes it necessarily a part of the world and hence physical. I am inclined to agree with Nietzsche. |
| 22159 | If we posit 'I' as the starting point, we miss the mind's phenomenal content [Heidegger] |
| Full Idea: One of our first tasks will be to prove that if we posit an 'I' or subject as that which is proximally given, we shall completely miss the phenomenal content of Dasein. | |
| From: Martin Heidegger (Being and Time [1927], I.1.10) | |
| A reaction: Descartes had thrown doubt on the informativeness of the phenomena, so presumably your phenomenologist is not interested in whether they reveal any truth. So why are unreliable phenomena of any interest? |
| 7112 | The Cogito depends on a second-order experience, of being conscious of consciousness [Sartre] |
| Full Idea: We must remember that all authors who have described the Cogito have presented it as a reflective operation, i.e. as second-order. This Cogito is performed by a consciousness directed towards consciousness, which takes consciousness as its object. | |
| From: Jean-Paul Sartre (Transcendence of the Ego [1937], I (B)) | |
| A reaction: Sartre is raising the nice question of whether the Cogito still works for first-order consciousness, which attends totally to external objects. He claims that it doesn't. Contrast Russell, who says (Idea 5380) that it only works when it is first-order! |
| 7114 | The consciousness that says 'I think' is not the consciousness that thinks [Sartre] |
| Full Idea: The consciousness that says 'I think' is precisely not the consciousness that thinks. | |
| From: Jean-Paul Sartre (Transcendence of the Ego [1937], I (B)) | |
| A reaction: All parties seem to be agreed that if we are going to introspect in search of our own ego, we must distinguish between the mental act of instrospection and the mental act of applying the mind to the world. Each gives a different result. |
| 7119 | Is the Cogito reporting an immediate experience of doubting, or the whole enterprise of doubting? [Sartre] |
| Full Idea: When Descartes says 'I doubt therefore I am', is he talking about the spontaneous doubt that reflective consciousness grasps in its instantaneous character, or is he talking of the enterprise of doubting? This ambiguity can lead to serious errors. | |
| From: Jean-Paul Sartre (Transcendence of the Ego [1937], II (B)) | |
| A reaction: Interesting. The obvious response is that it is about the immediate experience, but that leads to the problem of an instantaneous ego, which can't be justified over time. The 'enterprise' gives an enduring ego, but it is a more intellectual concept. |
| 19459 | To say 'I am not thinking' must be false, but it might have been true, so it isn't self-contradictory [Ayer] |
| Full Idea: To say 'I am not thinking' is self-stultifying since if it is said intelligently it must be false: but it is not self-contradictory. The proof that it is not self-contradictory is that it might have been false. | |
| From: A.J. Ayer (The Problem of Knowledge [1956], 2.iii) | |
| A reaction: If it doesn't imply a contradiction, then it is not a necessary truth, which is what it is normally taken to be. Is 'This is a sentence' necessarily true? It might not have been one, if the rules of English syntax changed recently. |
| 19460 | 'I know I exist' has no counterevidence, so it may be meaningless [Ayer] |
| Full Idea: If there is no experience at all of finding out that one is not conscious, or that one does not exist, ..it is tempting to say that sentences like 'I exist', 'I am conscious', 'I know that I exist' do not express genuine propositions. | |
| From: A.J. Ayer (The Problem of Knowledge [1956], 2.iii) | |
| A reaction: This is, of course, an application of the somewhat discredited verification principle, but the fact that strictly speaking the principle has been sort of refuted does not mean that we should not take it seriously, and be influenced by it. |
| 19461 | Knowing I exist reveals nothing at all about my nature [Ayer] |
| Full Idea: To know that one exists is not to know anything about oneself any more than knowing that 'this' exists is knowing anything about 'this'. | |
| From: A.J. Ayer (The Problem of Knowledge [1956], 2.iii) | |
| A reaction: Descartes proceeds to define himself as a 'thinking thing', inferring that thinking is his essence. Ayer casts nice doubt on that. |
| 6619 | Perhaps 'I' no more refers than the 'it' in 'it is raining' [Lowe] |
| Full Idea: Perhaps the 'I' in 'I think' no more serves to pick out a certain object than does the 'it' in 'it is raining'. | |
| From: E.J. Lowe (Introduction to the Philosophy of Mind [2000], Ch. 2) | |
| A reaction: A nice example to remind us that not all English pronouns have genuine reference. You could reply that 'it' does refer, to the weather; or that you can switch to 'you think', but not to 'they/we are raining'. |
| 12399 | There was a young student called Fred... [Sommers,W] |
| Full Idea: There was a young student called Fred,/ Who was questioned on Descartes and said:/ 'It's perfectly clear/ That I'm not really here,/ For I haven't a thought in my head.' [V.R. Ormerod] | |
| From: Will Sommers (talk [2019]) |
| 12407 | Barman to Descartes: Would you like another drink?... [Sommers,W] |
| Full Idea: Barman to Descartes: Would you like another drink? Descartes: I think not (...and promptly vanishes) | |
| From: Will Sommers (talk [2019]) |