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."
"I think; therefore I am."
"There is nothing more ancient than the truth."
"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."