"I have always held that the two questions, God and the Soul, were the chief of those which ought to be demonstrated by the help of philosophy rather than of theology."

"I am a thinking thing, a substance whose whole essence or nature consists in thinking, and there is no need of any place, nor does it depend on any material thing."

"The greatest good for man is to live according to reason."

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

"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."