Dean Winchester: This was supposed to be over. We were done. We were free. And now... What are we supposed to do, man? Do we just keep running in this... this... freaking hamster wheel until we die? Or until we get boring and he ends us?

Sam Winchester: Or we fight.

Dean Winchester: Fight God? Without the gun? It's God, Sam. And he's coming for us. How the hell are we supposed to fight God?