"This only is certain, that there is nothing certain; and nothing more miserable and yet more arrogant than man."

"No mortal man, moreover is wise at all moments."

"In these matters the only certainty is that nothing is certain."

"In comparing various authors with one another, I have discovered that some of the gravest and latest writers have transcribed, word for word, from former works, without making acknowledgment."

"Why is it that we entertain the belief that for every purpose odd numbers are the most effectual?"

"The best plan is to profit by the folly of others."

"It is only rarely that one can see in a little boy the promise of a man, but one can almost always see in a little girl the threat of a woman."

"In necessary things, unity; in doubtful things, liberty; in all things, charity."

"WITTICISM, n. A sharp and clever remark, usually quoted, and seldom noted; what the Philistine is pleased to call a 'joke.'"

"I did it partly because it was worth it, but mostly because I shall never have to do it again."

"Gratitude is a sickness suffered by dogs.'"

"We have left undone those things which we ought to have done; and we have done those things which we ought not to have done."