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Science is practical philosophy.

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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Your joy is your sorrow unmasked. And the self-same well from which your laughter rises was often-times filled with your tears.
Rene Descartes
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I accept no principles of physics which are not also accepted in mathematics.
Rene Descartes
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Nothing comes out of nothing.
Rene Descartes
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But possibly I am something more than I suppose myself to be.
Rene Descartes
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Doubt is the origin of wisdom
Rene Descartes
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Everything is self-evident.
Rene Descartes
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There is a great difference between mind and body insomuch as body is by nature always divisible, and the mind is entirely indivisible.
Rene Descartes
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There is nothing more ancient than the truth.
Rene Descartes
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If I simply refrain from making a judgment in cases where I do not perceive the truth with sufficient clarity and distinctness, then it is clear that I am behaving correctly and avoiding error.
Rene Descartes
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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.
Rene Descartes
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Except our own thoughts, there is nothing absolutely in our power.
Rene Descartes
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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.
Rene Descartes
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Each problem that I solved became a rule, which served afterwards to solve other problems.
Rene Descartes
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Perfect numbers like perfect men are very rare.
Rene Descartes
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Reason is nothing without imagination.
Rene Descartes
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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.
Rene Descartes
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Even those who have the weakest souls could acquire absolute mastery over all their passions if we employed sufficient ingenuity in training and guiding them.
Rene Descartes
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It is not enough to have a good mind. The main thing is to use it well.
Rene Descartes
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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.
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