Look, Castiel. I don't blame you for being angry. If you--if anyone--touched any of the people I'm invested in, I'd kill you all before you had the chance to explain. But then, that probably won't happen because I make sure that the people I've taken in are protected. Even against each other.

[He looks at him somberly. Then refills his glass.] If you had bothered to get to know Erik, you would have seen that thing with Crowley coming with plenty of time to stop it. I'm telling you, one angel to another, don't be so naive. Get to know people. Their secrets. The things they'll never tell anyone else. It's the only way you can predict them.