A liberal mind is a mind that is able to imagine itself believing anything

It is the ability to take a joke, not make one, that proves you have a sense of humor.

Humor is the instinct for taking pain playfully.

Emotion is the surest arbiter of a poetic choice, and it is the priest of all supreme unions in the mind.

A joke is not a thing but a process, a trick you play on the listener's mind. You start him off toward a plausible goal, and then by a sudden twist you land him nowhere at all or just where he didn't expect to go.

Dogs laugh, but they laugh with their tails. What puts man in a higher state of evolution is that he has got his laugh on the right end.