Sam Winchester: Rowena. I know what you went through and I know how much you lost and I realize how much you want your family back. But don't do this, not like this. This is not you. Not anymore.
Rowena: What happened to me, those were my choices. But Fergus never... It wasn't fair. It's not fair! (Rowena attacks Death with no effect)
Billie/Death: You were never gonna kill him. There was a time you would've, but not now. I can see that.
Rowena: I don't know what I'm doing.
Billie/Death: Sometimes life is unfair and sometimes we lose things and sometimes we make mistakes. And some of these things can never be fixed no matter how powerful you become. Some things just are, and everyone has to live with that.
Billie: It’s over.
Sam Winchester: What’s over?
Billie: You and Dean dying and coming back again and again. The old Death thought it was funny, but now there is one hard fast rule in this universe. What lives, dies.
Billie: Since I got this... new job, I stand witness to a much larger picture. Do you know what I see? You. And your brother. You're important.
Dean Winchester: Why?
Billie: You have work to do.
Billie (to Dean): That doesn't sound like the Dean Winchester I know and love. The man who's been dead so many times but it never seemed to stick. Maybe you're not that guy anymore, the guy who saves the world, the guy who always thinks he'll win no matter what. You have changed. And you tell people it's not a big deal. You tell people you'll work through it, but you know you won't, you can't, and that scares the hell out of you.