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I accept no principles of physics which are not also accepted in mathematics.

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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Travelling is almost like talking with those of other centuries.
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In order to improve the mind, we ought less to learn, than to contemplate.
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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 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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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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Except our own thoughts, there is nothing absolutely in our power.
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Variant: When it is not in our power to follow what is true, we ought to follow what is most probable.
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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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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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Illusory joy is often worth more than genuine sorrow.
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He who hid well, lived well.
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Science is practical philosophy.
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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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There is nothing more ancient than the truth.
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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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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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He lives well who is well hidden.
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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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Doubt is the origin of wisdom
Rene Descartes