Never argue with a fool, onlookers may not be able to tell the difference.

The tongue of a fool is the key of his counsel, which, in a wise man, wisdom hath in keeping.

A fool despises good counsel, but a wise man takes it to heart.

I am a fool, but I know I'm a fool and that makes me smarter than you.

The fool has one great advantage over a man of sense; he is always satisfied with himself.

Fools call wise men fools. A wise man never calls any man a fool.