The best way to convince a fool that he is wrong is to let him have his own way.

Foolproof systems don't take into account the ingenuity of fools.

You will do foolish things, but do them with enthusiasm.

When in doubt, make a fool of yourself. There is a microscopically thin line between being brilliantly creative and acting like the most gigantic idiot on earth. So what the hell, leap.

People are never so near playing the fool as when they think themselves wise.

For fools rush in where angels fear to tread.

... there are no fools ...

Lord, what fools these mortals be!

Give me the young man who has brains enough to make a fool of himself.

If thou hast never been a fool, be sure thou wilt never be a wise man.