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Omnia apud me mathematica fiunt.

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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How can you be certain that your whole life is not a dream?
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We do not describe the world we see, we see the world we can describe.
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Neither the true nor the false roots are always real sometimes they are imaginary that is, while we can always imagine as many roots for each equation as I have assigned, yet there is not always a definite quantity corresponding to each root we have imagined.
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Each problem that I solved became a rule, which served afterwards to solve other problems.
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The rainbow is such a remarkable phenomenon of nature, and its cause has been so meticulously sought after by inquiring minds throughout the ages, that I could not choose a more appropriate subject for demonstrating how, with the method I am using, we can arrive at knowledge not possessed at all by those whose writings are available to us.
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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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Sensations are nothing but confused modes of thinking.
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The two operations of our understanding, intuition and deduction, on which alone we have said we must rely in the acquisition of knowledge.
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Give me extension and motion and I will construct the universe.
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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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Perfect numbers like perfect men are very rare.
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Conquer yourself rather than the world.
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Divide each difficulty at hand into as many pieces as possible and as could be required to better solve them.
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In order to improve the mind, we ought less to learn, than to contemplate.
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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.
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.
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And thereby make ourselves, as it were, the lords and masters of nature.
Rene Descartes
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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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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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If I found any new truths in the sciences, I can say that they follow from, or depend on, five or six principal problems which I succeeded in solving and which I regard as so many battles where the fortunes of war were on my side.
Rene Descartes