We should render a service to a friend to bind him closer to us, and to an enemy in order to make a friend of him

Render the best service wherever you find yourself

The only service a friend can really render is to keep your courage by holding up to you a mirror in which you can see a noble image of yourself

And this was your friend?" Cordelia raised her eyebrows. "Seems to me the only difference between your friends and your enemies is how long the stand around chatting before they shoot you.

Enemies disguise as friends and friends as enemies.

I suppose [...] that the most convincing way to fool an enemy would be to fool a friend.