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I know that I exist the question is, What is this 'I' that 'I' know.

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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A state is better governed which has few laws, and those laws strictly observed.
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And thereby make ourselves, as it were, the lords and masters of nature.
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Travelling is almost like talking with those of other centuries.
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Thus each truth discovered was a rule available in the discovery of subsequent ones.
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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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Illusory joy is often worth more than genuine sorrow.
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Give me extension and motion and I will construct the universe.
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We do not describe the world we see, we see the world we can describe.
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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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I was convinced that our beliefs are based much more on custom and example than on any certain knowledge.
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Let whoever can do so deceive me, he will never bring it about that I am nothing, so long as I continue to think I am something.
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It is not enough to have a good mind. The main thing is to use it well.
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Doubt is the origin of wisdom
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There is nothing more ancient than the truth.
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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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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?
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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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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 only thing we have power over in the universe is our own thoughts.
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De omnibus dubitandum
Rene Descartes