Sam Winchester: You know, this is bothering me.
Diana Ballard: Well, you are digging up a corpse.
Sam Winchester: No, not that. That's pretty par for the course, actually.
Diana Ballard: Then what?
Sam Winchester: It's just... I mean, no vengeful spirit I've ever tussled with... wanted to be wasted. So why the hell would Claire lead us to her remains? It doesn't make any sense.
Belphegor: Shouldn't we at least try and be friends? Sam and Dean, they seem to be coming around. I think I'm, uh, growing on them. You know, like a cancer.
Castiel: You are not growing on anyone. Sam and Dean are just using you. Don't mistake that for caring about you, because I can assure you they don't.
Belphegor: Wow. You learn that the hard way?
Castiel (to Dean): Even if we didn't know that all of the challenges that we face were born of Chuck's machinations, how would we describe it all? We'd call it "life". Because that's precisely what life is. It's an obstacle course, and maybe Chuck designed the obstacles, but we ran our own race. We made our own moves. And mostly, we did well with that.
Andy Gallagher: Tell the truth.
Dean Winchester: We hunt demons. Demons, spirits. Things your worst nightmares wouldn't even touch. Sam here is my brother.
Sam Winchester: Dean, shut up.
Dean Winchester: I'm trying. He's psychic, kinda like you. But not really like you. But see he thinks you're a murderer. And he's afraid he's gonna become one himself, because you're all part of something that's terrible. I hope to hell he's wrong, but I'm starting to get scared he might be right.
Dean Winchester: Back at the hospital, you know, full recovery. It was a miracle. And five minutes later, Dad's dead and the Colt's gone. You can't tell me there's not a connection there. I don't know how the demon was involved. I don't know how the whole thing went down, exactly. But Dad's dead because of me. And that much I do know.
Sam Winchester: We don't know that. Not for sure.
Dean Winchester: Sam... you and Dad... you're the most important people in my life. And now.... I never should've come back, Sam. It wasn't natural. And now look what's come of it. I was dead. And I should have stayed dead. You wanted to know how I was feeling. Well, that's it. So tell me... what could you possibly say to make that all right?