“Cogito ergo sum. [I think, therefore I am.]”
“Except our own thoughts, there is nothing absolutely in our power.”
“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.”
“It is not enough to have a good mind. The main thing is to use it well.”
—From “Le discours de la methode”
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