[D]on't grow old. With age comes caution, which is another name for cowardice.... Whatever else you do in life, don't cultivate a conscience. Without a conscience a man may never be said to grow old. This is an age of very old young men.

An author should be delighted, not annoyed when he hears himself persistently misquoted. He could receive no higher compliment. It proves that the world has frequent and urgent need of his thoughts and will rather change the manner in which he expresses them than do without the things expressed.

When people are old enough to know better they are old enough to do worse.

A man's character never changes radically from youth to old age. What happens is that circumstances bring out characteristics which have not been obvious to the superficial observer.

Misquotation is, in fact, the pride and privilege of the learned. A widely- read man never quotes accurately, for the rather obvious reason that he has read too widely.

Never neglect an opportunity to play leap-frog it is the best of all games, and, unlike the terribly serious and conscientious pastimes of modern youth, will never become professionalized.