I choose my friends for their good looks, my acquaintances for their good characters, and my enemies for their good intellects.

I would sooner lose my best friend than my worst enemy. To have friends, you know, one need only be good-natured; but when a man has no enemy left there must be something mean about him.

Always forgive your enemies; nothing annoys them so much.

A man cannot be too careful in his choice of enemies. I have not got one who is a fool. They are all men of some intellectual power, and consequently they all appreciate me.

In all matters of opinion, our adversaries are insane.