"The greatest good is to live according to the dictates of right reason."

"The light of natural reason is sufficient to give us a clear and distinct conception of God."

"I confess that I have never been able to find out what is the 'substantial form' of a human body, or how it differs from the form of a statue."

"I suppose therefore that all I see is false. I believe that none of what my deceptive memory represents to me ever existed."

"All that is solid melts into air."