I know it would suck to be your enemy but I would much rather be your enemy than your friend because I would at least know it is real..

When you look at yourself you will find your worst enemy. Maybe not literal but it is very typical.

Misery becomes your friend when your best friends prevail.

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.