"I suppose therefore that all the things I see are false imaginations; I believe that nothing ever existed of all that my fallacious memory represents to me."

"I entirely abandoned the study of letters, resolving to seek no other science than that which could be found in myself, or at least in the great book of the world."

"The senses deceive from time to time, and it is prudent never to trust wholly those who have deceived us even once."

"I desire to live in peace and to be useful to all men."

"The body is a machine."