Sam Winchester: What you're doing now, i-it's... it's wrong! It's quitting! I mean, l-look what just happened. Donatello never quit fighting. So we could help him because he gave up. I believe in us, Dean. (Sam punches Dean) I believe in us. (they hug) Why don't you believe in us, too?

Dean Winchester: Okay, Sam. Let's go home.

Sam Winchester: What?

Dean Winchester: Let's go home. Maybe Billie's wrong. Maybe. But I do believe in us. I believe in all of us. And I'll keep believing until I can't. Until there's absolutely no other way. But when that day comes... if that day comes... Sam, you have to take it for what it is... the end. And you have to promise me that you'll do then what you can't do now, and that's let me go. And put me in that box. (turns to Cas): You, too.

Sam Winchester: Yeah, all right. All right. All right.

Dean Winchester: Now, you heard me. Let's go home. Just don't hit me again, okay?