More quotes by René Descartes

"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."
"I think; therefore I am."
"Let whoever can do so deceive me, he will never bring it about that I am nothing, so long as I continue to think I am something."
"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."
"Common sense is the most widely shared commodity in the world, for every man is convinced that he is well supplied with it."