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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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More quotes by Rene Descartes

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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.
Rene Descartes
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There is nothing more ancient than the truth.
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Sensations are nothing but confused modes of thinking.
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The only thing we have power over in the universe is our own thoughts.
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Doubt is the origin of wisdom
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Each problem that I solved became a rule, which served afterwards to solve other problems.
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He lives well who is well hidden.
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Few look for truth many prowl about for a reputation of profundity by arrogantly challenging whichever arguments are the best.
Rene Descartes
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It is possible that I am dreaming right now and that all of my perceptions are false.
Rene Descartes
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Omnia apud me mathematica fiunt.
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Hence reason also demands that, since our thoughts cannot all be true because we are not wholly perfect, what truth they do possess must inevitably be found in the thoughts we have when awake, rather than in our dreams.
Rene Descartes
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The rainbow is such a remarkable phenomenon of nature, and its cause has been so meticulously sought after by inquiring minds throughout the ages, that I could not choose a more appropriate subject for demonstrating how, with the method I am using, we can arrive at knowledge not possessed at all by those whose writings are available to us.
Rene Descartes
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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.
Rene Descartes
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Instead I ought to be grateful to Him who never owed me anything for having been so generous to me, rather than think that He deprived me of those things or has taken away from me whatever He did not give me.
Rene Descartes
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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.
Rene Descartes
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We never understand a thing so well,and make it our own, as when we have discovered it for ourselves.
Rene Descartes
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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.
Rene Descartes
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Intuitive knowledge is an illumination of the soul, whereby it beholds in the light of God those things which it pleases Him to reveal to us by a direct impression of divine clearness.
Rene Descartes
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How can you be certain that your whole life is not a dream?
Rene Descartes
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The reading of all good books is indeed like a conversation with the noblest men of past centuries who were the authors of them, nay a carefully studied conversation, in which they reveal to us none but the best of their thoughts.
Rene Descartes