René 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

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I suppose therefore that all things I see are illusions; I believe that nothing has ever existed of everything my lying memory tells me. I think I have no senses. I believe that body, shape, extension, motion, location are functions. What is there then that can be taken as true? Perhaps only this one thing, that nothing at all is certain

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Common sense is the most widely shared commodity in the world, for every man is convinced that he is well supplied with it

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Except our own thoughts, there is nothing absolutely in our power

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And thus, the actions of life often not allowing any delay, it is a truth very certain that, when it is not in our power to determine the most true opinions we ought to follow the most probable