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

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

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

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

We are not enemies, but friends. We must not be enemies. Though passion may have strained, it must not break our bonds of affection. The mystic cords of memory will swell when again touched as surely they will be by the better angels of our nature.

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