Rene Descartes Quotes on Truth
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Cogito, ergo sum.
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The first precept was never to accept a thing as true until I knew it as such without a single doubt.
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Je pense, donc je suis.
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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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Everything is self-evident.
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I concluded that I might take as a general rule the principle that all things which we very clearly and obviously conceive are true: only observing, however, that there is some difficulty in rightly determining the objects which we distinctly conceive.
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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.
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Illusory joy is often worth more than genuine sorrow.
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De omnibus dubitandum
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To know what people really think, pay regard to what they do, rather than what they say.
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When it is not in our power to determine what is true, we ought to follow what is most probable.