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How can you be certain that your whole life is not a dream?

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
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Illusory joy is often worth more than genuine sorrow.
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Thus each truth discovered was a rule available in the discovery of subsequent ones.
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Omnia apud me mathematica fiunt.
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If I go for the alternative which is false, then obviously I shall be in error if I take the other side, then it is by... chance that I arrive at the truth, and I shall still be at fault.... In this incorrect use of free will may be found the privation which constitutes the essence of error.
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...it is certain that I am really distinct from my body, and can exist without it.
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How do we know that anything really exists, that anything is really the way it seems ot us through our senses?
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The only secure knowledge is that I exist.
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The only thing we have power over in the universe is our own thoughts.
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There is nothing more ancient than the truth.
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Wonder is the first of all the passions.
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De omnibus dubitandum
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In God there is an infinitude of things which I cannot comprehend, nor possibly even reach in any way by thought for it is the nature of the infinite that my nature, which is finite and limited, should not comprehend it.
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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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Everything is self-evident.
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Travelling is almost like talking with those of other centuries.
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This result could have been achieved either by his [God] endowing my intellect with a clear and distinct perception of everything about which I would ever deliberate, or simply by impressing the following rule so firmly upon my memory that I could never forget it: I should never judge anything that I do not clearly and distinctly understand.
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Nothing comes out of nothing.
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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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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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Science is practical philosophy.
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