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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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Rene Descartes
Age: 53 †
Born: 1596
Born: March 31
Died: 1650
Died: February 11
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La Haye en Touraine
Descartes
Cartesius
Renatus Cartesius
Imagine
Sleep
Dream
Things
Lunatics
Accustomed
Awake
Dreams

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I accept no principles of physics which are not also accepted in mathematics.
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Whenever anyone has offended me, I try to raise my soul so high that the offense cannot reach it.
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God alone is the author of all the motions in the world.
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If I simply refrain from making a judgment in cases where I do not perceive the truth with sufficient clarity and distinctness, then it is clear that I am behaving correctly and avoiding error.
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Thus each truth discovered was a rule available in the discovery of subsequent ones.
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A person has two passions for love and abhorrence. A big disposition to excessiveness has just a love, because it is more ardent and stronger.
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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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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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Just as we believe by faith that the greatest happiness of the next life consists simply in the contemplation of this divine majesty, likewise we experience that we derive the greatest joy of which we are capable in this life from the same contemplation, even though it is much less perfect.
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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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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.
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If you would be a real seeker after truth, it is necessary that at least once in your life you doubt, as far as possible, all things.
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Wonder is the first of all the passions.
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On the one hand I have a clear and distinct idea of myself, in so far as I am a thinking, non-extended thing and on the other hand I have a distinct idea of body, in so far a this is simply an extended, non-thinking thing. And, accordingly, it is certain that I am really distinct from my body, and exist without it.
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It is possible that I am dreaming right now and that all of my perceptions are false.
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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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...it is certain that I am really distinct from my body, and can exist without it.
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There is nothing more ancient than the truth.
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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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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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