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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

Rene Descartes

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Rene Descartes
Age: 53 †
Born: 1596
Born: March 31
Died: 1650
Died: February 11
Astronomer
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Mathematician
Mechanical Automaton Engineer
Military Personnel
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Musicologist
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La Haye en Touraine
Descartes
Cartesius
Renatus Cartesius
Think
Therefore
Thinking
Genius
Simply
Doubt
Fact
Facts
Everything
Thing
Except

More quotes by Rene Descartes

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Few look for truth many prowl about for a reputation of profundity by arrogantly challenging whichever arguments are the best.
Rene Descartes
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De omnibus dubitandum
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Each problem that I solved became a rule, which served afterwards to solve other problems.
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If ... it is not in my power to arrive at the knowledge of any truth, I may at least do what is in my power, namely, suspend judgement.
Rene Descartes
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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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It's the familiar love-hate syndrome of seduction: I don't really care what it is I say, I care only that you like it.
Rene Descartes
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Reason is nothing without imagination.
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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Sensations are nothing but confused modes of thinking.
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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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.
Rene Descartes
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...it is certain that I am really distinct from my body, and can exist without it.
Rene Descartes
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Wonder is the first of all the passions.
Rene Descartes
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Thus each truth discovered was a rule available in the discovery of subsequent ones.
Rene Descartes
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Give me extension and motion and I will construct the universe.
Rene Descartes
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God alone is the author of all the motions in the world.
Rene Descartes
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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
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The only thing we have power over in the universe is our own thoughts.
Rene Descartes
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Variant: When it is not in our power to follow what is true, we ought to follow what is most probable.
Rene Descartes
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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.
Rene Descartes