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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.: Principles of Philosophy
It is not enough to have a good mind. The main thing is to use it well.: Discourse on Method
I think, therefore I am. (Cogito, ergo sum.): Discourse on Method
Common sense is the best distributed thing in the world, for everyone thinks he is so well-endowed with it that even those who are hardest to satisfy in all other matters are not in the habit of desiring more of it than they already have.: Discourse on Method