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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
Correspondent
Mathematician
Mechanical Automaton Engineer
Military Personnel
Music Theorist
Musicologist
Philosopher
Physicist
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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I should consider that I know nothing about physics if I were able to explain only how things might be, and were unable to demonstrate that they could not be otherwise.
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De omnibus dubitandum
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I was convinced that our beliefs are based much more on custom and example than on any certain knowledge.
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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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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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Science is practical philosophy.
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Conquer yourself rather than the world.
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He lives well who is well hidden.
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Everything is self-evident.
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Your joy is your sorrow unmasked. And the self-same well from which your laughter rises was often-times filled with your tears.
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And I shall always hold myself more obliged to those by whose favour I enjoy uninterrupted leisure than to any who might offer me the most honourable positions in the world.
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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.
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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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I accept no principles of physics which are not also accepted in mathematics.
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.
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Except our own thoughts, there is nothing absolutely in our power.
Rene Descartes
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...it is certain that I am really distinct from my body, and can exist without it.
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For I found myself embarrassed with so many doubts and errors that it seemed to me that the effort to instruct myself had no effect other than th eincreasing discovery of my own ignorance
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In order to improve the mind, we ought less to learn, than to contemplate.
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So blind is the curiosity by which mortals are possessed, that they often conduct their minds along unexplored routes, having no reason to hope for success, but merely being willing to risk the experiment of finding whether the truth they seek lies there.
Rene Descartes