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."
"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."
"Except our own thoughts, there is nothing absolutely in our power."
"But in my opinion, all things in nature occur mathematically."
"To live without philosophizing is in truth the same as keeping the eyes closed without attempting to open them."