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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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Sensations are nothing but confused modes of thinking.
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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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Except our own thoughts, there is nothing absolutely in our power.
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Common sense is the best distributed thing in the world, for we all think we possess a good share of it.
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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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We never understand a thing so well,and make it our own, as when we have discovered it for ourselves.
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God alone is the author of all the motions in the world.
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Everybody thinks himself so well supplied with common sense that even those most difficult to please. . . never desire more of it than they already have.
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Doubt is the origin of wisdom
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Perfect numbers like perfect men are very rare.
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Thus each truth discovered was a rule available in the discovery of subsequent ones.
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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?
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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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Reason is nothing without imagination.
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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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Illusory joy is often worth more than genuine sorrow.
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I know that I exist the question is, What is this 'I' that 'I' know.
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There is nothing more ancient than the truth.
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The greatest minds, as they are capable of the highest excellencies, are open likewise to the greatest aberrations and those who travel very slowly may yet make far greater progress, provided they keep always to the straight road, than those who, while they run, forsake it.
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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