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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
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Renatus Cartesius
Lunatics
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Dreams
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More quotes by Rene Descartes

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I experienced in myself a certain capacity for judging which I have doubtless received from God, like all the other things that I possess and as He could not desire to deceive me, it is clear that He has not given me a faculty that will lead me to err if I use it aright.
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Perfect numbers like perfect men are very rare.
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Few look for truth many prowl about for a reputation of profundity by arrogantly challenging whichever arguments are the best.
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The only thing we have power over in the universe is our own thoughts.
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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.
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Even if I were to suppose that I was dreaming and whatever I saw or imagined was false, yet I could not deny that ideas were truly in my mind.
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Thus each truth discovered was a rule available in the discovery of subsequent ones.
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Science is practical philosophy.
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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.
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... moral certainty is certainty which is sufficient to regulate our behaviour, or which measures up to the certainty we have on matters relating to the conduct of life which we never normally doubt, though we know that it is possible, absolutely speaking, that they may be false.
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I know that I exist the question is, What is this 'I' that 'I' know.
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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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Whenever anyone has offended me, I try to raise my soul so high that the offense cannot reach it.
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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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I can doubt everything, except one thing, and that is the very fact that I doubt. Simply put - I think, therefore I am
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The two operations of our understanding, intuition and deduction, on which alone we have said we must rely in the acquisition of knowledge.
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Illusory joy is often worth more than genuine sorrow.
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It is to the body alone that we should attribute everything that can be observed in us to oppose our reason.
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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.
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Except our own thoughts, there is nothing absolutely in our power.
Rene Descartes