Love your enemies just in case your friends turn out to be bastards.

Treat your friend as if he will one day be your enemy, and your enemy as if he will one day be your friend

The face of the enemy frightens me only when I see how much it resembles me

A friend is one who has the same enemies as you have

A friend is one who has the same enemies as you have.

Do I not destroy my enemies when I make them my friends?