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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

Rene Descartes

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Rene Descartes
Age: 53 †
Born: 1596
Born: March 31
Died: 1650
Died: February 11
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More quotes by 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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...it is certain that I am really distinct from my body, and can exist without it.
Rene Descartes
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Divide each difficulty at hand into as many pieces as possible and as could be required to better solve them.
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.
Rene Descartes
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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.
Rene Descartes
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Thus each truth discovered was a rule available in the discovery of subsequent ones.
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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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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God alone is the author of all the motions in the world.
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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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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... 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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I was convinced that our beliefs are based much more on custom and example than on any certain knowledge.
Rene Descartes
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Everything is self-evident.
Rene Descartes
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A person has two passions for love and abhorrence. A big disposition to excessiveness has just a love, because it is more ardent and stronger.
Rene Descartes
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The principal effect of the passions is that they incite and persuade the mind to will the events for which they prepared the body.
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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It is not enough to have a good mind. The main thing is to use it well.
Rene Descartes
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Everybody thinks himself so well supplied with common sense that even those most difficult to please. . . never desire more of it than they already have.
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