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Let whoever can do so deceive me, he will never bring it about that I am nothing, so long as I continue to think I am something.

Rene Descartes

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Rene Descartes
Age: 53 †
Born: 1596
Born: March 31
Died: 1650
Died: February 11
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La Haye en Touraine
Descartes
Cartesius
Renatus Cartesius
Long
Something
Deceive
Never
Deceiving
Think
Whoever
Thinking
Continue
Bring
Nothing

More quotes by Rene Descartes

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In order to improve the mind, we ought less to learn, than to contemplate.
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The reading of all good books is indeed like a conversation with the noblest men of past centuries who were the authors of them, nay a carefully studied conversation, in which they reveal to us none but the best of their thoughts.
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Give me extension and motion and I will construct the universe.
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I hope that posterity will judge me kindly, not only as to the things which I have explained, but also to those which I have intentionally omitted so as to leave to others the pleasure of discovery.
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There is a little gland in the brain in which the soul exercises its functions in a more particular way than in the other parts.
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Even those who have the weakest souls could acquire absolute mastery over all their passions if we employed sufficient ingenuity in training and guiding them.
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The only thing we have power over in the universe is our own thoughts.
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I can doubt everything, except one thing, and that is the very fact that I doubt. Simply put - I think, therefore I am
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With me, everything turns into mathematics.
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How can you be certain that your whole life is not a dream?
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It is contrary to reasoning to say that there is a vacuum or space in which there is absolutely nothing.
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It is to the body alone that we should attribute everything that can be observed in us to oppose our reason.
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For how do we know that the thoughts which occur in dreaming are false rather than those others which we experience when awake, since the former are often not less vivid and distinct than the latter?
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There is a difference between happiness, the supreme good, and the final end or goal toward which our actions ought to tend. For happiness is not the supreme good, but presupposes it, being the contentment or satisfaction of the mind which results from possessing it.
Rene Descartes
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I know that I exist the question is, What is this 'I' that 'I' know.
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This result could have been achieved either by his [God] endowing my intellect with a clear and distinct perception of everything about which I would ever deliberate, or simply by impressing the following rule so firmly upon my memory that I could never forget it: I should never judge anything that I do not clearly and distinctly understand.
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If you would be a real seeker after truth, it is necessary that at least once in your life you doubt, as far as possible, all things.
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The nature of matter, or body considered in general, consists not in its being something which is hard or heavy or coloured, or which affects the senses in any way, but simply in its being something which is extended in length, breadth and depth.
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There is a great difference between mind and body insomuch as body is by nature always divisible, and the mind is entirely indivisible.
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... moral certainty is certainty which is sufficient to regulate our behaviour, or which measures up to the certainty we have on matters relating to the conduct of life which we never normally doubt, though we know that it is possible, absolutely speaking, that they may be false.
Rene Descartes