"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."

"People don't live nowadays --- they get about ten percent out of life."

"War is hell, and I mean to make it so."

"Opinion is ultimately determined by the feelings, and not by the intellect."

"Never be bored, and you will never be boring."

"And Nathan said to David, Thou art the man."

"As a kid, I knew I wanted to be either a cartoonist or an astronaut. The latter was never much of a possibility, as I don't even like riding in elevators."