"I'm proof against that word failure. I've seen behind it. The only failure a man ought to fear is failure of cleaving to the purpose he sees to be best."

"Adventure is not outside man; it is within."

"Animals are such agreeable friends - they ask no questions; they pass no criticisms."

"There is only one failure in life possible, and that is not to be true to the best one knows."

"In the nineteenth century the problem was that God is dead. In the twentieth century the problem is that man is dead."

"History warns us that it is the customary fate of new truths to begin as heresies and to end as superstitions."

"We are fast approaching the stage of the ultimate inversion: the stage where the government is free to do anything it pleases, while the citizens may act only by permission; which is the stage of the darkest periods of human history, the stage of rule by brute force."

"When you think of how history is revealed, we know certain things to be facts at certain periods of time, which turn out not to be so factual as time marches on."