I suppose therefore that all things I see are illusions; I b... - 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."

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More quotes by René Descartes

"Except our own thoughts, there is nothing absolutely in our power."
"The reading of all good books is like conversation with the finest men of past centuries."
"To live without philosophizing is in truth the same as keeping the eyes closed without attempting to open them."
"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."
"There is nothing more ancient than the truth."