Common sense is the most widely shared commodity in the worl... - René Descartes

"There is nothing more ancient than the truth."

"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."

"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 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."