Sam Winchester: When it comes to you, you just throw in the towel? Or are you sorry that, after all these years, our entire lives, a-after I've looked up to you, after I've learned from you, I-I-I've copied you, I followed you to Hell and back, are you sorry that all of that... it... it... it means nothing now?

Dean Winchester: Who's saying that?

Sam Winchester: You are, when you tell me I have to kill you. When you're telling me that I have to just throw away everything we stand for, throw away faith, throw away family. We're the guys who save the world. We don't just check out of it!