Dean Winchester: Sam, we are not gonna make the same mistake all over again.
Sam Winchester: You said that, but what does that mean?
Dean Winchester: Don't you see a pattern here? Dad's deal, my deal, now this. Every time one of us is up the creek, the other's begging to sell their soul. That's all this is, man. Ruby's just jerking your chain down the road. You know what it's paved with, and you know where it's going.
Sam Winchester: Dean. What are you afraid is gonna happen? This is me, I can handle it. And if it'll save you...
Dean Winchester: Why even risk it?
Sam Winchester: Because you're my brother. Because you did the same thing for me.
Dean Winchester: I know. And look how that turned out. All I'm saying... Sammy, all I'm saying is that you're my weak spot. You are. And I'm yours.
Sam Winchester: No, you don't mean that. We're family.
Dean Winchester: I know. And those evil sons of b*tches know it too. I mean, what we'll do for each other, you know, how far we'll go. They're using it against us.
Sam Winchester: So we just stop looking out for each other?
Dean Winchester: No, we stop being martyrs. Man, we stop spreading it for these demons. We take this knife and we go after Lilith our way. The way Dad taught us to. And if we go down, then, uh... then we go down swinging. What do you think?
Sam Winchester: I think you totally should have been jamming "Eye of the Tiger" right there.
Dean Winchester: Oh, bite me. You know, I totally rehearsed that speech too.
