"We do not describe the world we see, we see the world we can describe."
"I am thinking, therefore I exist. (...) I was a substance whose whole essence or nature is solely to think, and which does not require any place, or depend on any material thing, in order to exist. Accordingly this 'I' - that is, the soul by which I am what I am - is entirely distinct from the body, and indeed is easier to know than the body, and would not fail to be whatever it is, even if the body did not exist."
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Source: Principia Philosophiae pt. 2, sec. 16 (1644)
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More quotes by Rene Descartes
"Whenever anyone has offended me, I try to raise my soul so high that the offense cannot reach it."
"It is not enough to have a good mind. The main thing is to use it well."
"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."
"By 'God', I understand, a substance which is infinite, independent, supremely intelligent, supremely powerful, and which created both myself and everything else [...] that exists. All these attributes are such that, the more carefully I concentrate on them, the less possible it seems that they could have originated from me alone. So, from what has been said it must be concluded that God necessarily exists."
"De omnibus dubitandum"