“All knowledge degenerates into probability.”

“Knowledge is of no value unless you put it into practice.”

“A wise man proportions his belief to the evidence.”

“If God is omnipotent, omniscient and wholly good, whence evil? If God wills to prevent evil but cannot, then He is not omnipotent. If He can prevent evil but does not, then he is not good. In either case he is not God.”

“When men are most sure and arrogant they are commonly most mistaken.”

“Beauty in things exists in the mind which contemplates them.”

“Nothing is more surprising than the easiness with which the many are governed by the few.”