More quotes by René Descartes

"I think; therefore I am."
"Common sense is the most widely shared commodity in the world, for every man is convinced that he is well supplied with it."
"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."
"But in my opinion, all things in nature occur mathematically."
"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."