More quotes by René Descartes

"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."
"But in my opinion, all things in nature occur mathematically."
"Common sense is the most widely shared commodity in the world, for every man is convinced that he is well supplied with it."
"The reading of all good books is like conversation with the finest men of past centuries."
"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."