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Intuition is the undoubting conception of a pure and attentive mind, which arises from the light of reason alone, and is more certain than deduction.

Rene Descartes

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Rene Descartes
Age: 53 †
Born: 1596
Born: March 31
Died: 1650
Died: February 11
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More quotes by Rene Descartes

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But possibly I am something more than I suppose myself to be.
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We call infinite that thing whose limits we have not perceived, and so by that word we do not signify what we understand about a thing, but rather what we do not understand.
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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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I experienced in myself a certain capacity for judging which I have doubtless received from God, like all the other things that I possess and as He could not desire to deceive me, it is clear that He has not given me a faculty that will lead me to err if I use it aright.
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Travelling is almost like talking with those of other centuries.
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The principal effect of the passions is that they incite and persuade the mind to will the events for which they prepared the body.
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In God there is an infinitude of things which I cannot comprehend, nor possibly even reach in any way by thought for it is the nature of the infinite that my nature, which is finite and limited, should not comprehend it.
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How can you be certain that your whole life is not a dream?
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[About Pierre de Fermat] It cannot be denied that he has had many exceptional ideas, and that he is a highly intelligent man. For my part, however, I have always been taught to take a broad overview of things, in order to be able to deduce from them general rules, which might be applicable elsewhere.
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...it is certain that I am really distinct from my body, and can exist without it.
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I suppose therefore that all things I see are illusions I believe that nothing has ever existed of everything my lying memory tells me. I think I have no senses. I believe that body, shape, extension, motion, location are functions. What is there then that can be taken as true? Perhaps only this one thing, that nothing at all is certain.
Rene Descartes
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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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I am accustomed to sleep and in my dreams to imagine the same things that lunatics imagine when awake.
Rene Descartes
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In order to improve the mind, we ought less to learn, than to contemplate.
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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
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When I consider this carefully, I find not a single property which with certainty separates the waking state from the dream. How can you be certain that your whole life is not a dream?
Rene Descartes
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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.
Rene Descartes
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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?
Rene Descartes
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I am thing that thinks: that is, a things that doubts,affirms, denies, understands a few things, is ignorant of many things, is willing, is unwilling, and also which imagines and has sensory perceptions.
Rene Descartes
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Instead I ought to be grateful to Him who never owed me anything for having been so generous to me, rather than think that He deprived me of those things or has taken away from me whatever He did not give me.
Rene Descartes