"I hope that posterity will judge me kindly, not only as to the things which I have explained, but also to those which I have intentionally omitted so as to leave to others the pleasure of discovery."
"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."