We are all here on earth to help others; what on earth the others are here for I don't know.

Among those whom I like or admire, I can find no common denominator, but among those whom I love, I can: all of them make me laugh.

A professor is someone who talks in someone else's sleep.

Geniuses are the luckiest of mortals because what they must do is the same as what they most want to do.

The center that I cannot find is known to my unconscious mind.