Sam Winchester: Our mom, Mary, she's trapped on the other side. If we can get your powers back, maybe we can open that door up. Maybe...
Jack: You wanna save her.
Sam Winchester: Yeah. Yeah, I do. But... if this doesn't work, if that can't happen, that's okay, because I do care about you. But I should've told you. I'm sorry.
Jack: Sam. Why are you being so nice to me?
Sam Winchester: Because I know what it feels like to feel like you don't belong, to feel like there's this darkness inside of you, to be scared of who you are, what you can do. Dean, Cas... my family helped me through that. So now I wanna help you. Because you're not evil, Jack.
Sam Winchester: Dean doesn't hate you. It... Look, sometimes the wires in Dean's head get crossed and... and he gets frustrated, and then he mixes frustration with anger, and... and... and fear.
Jack: Why would he be afraid?
Sam Winchester: Because Dean feels like it's his job to protect everyone. And right now, we need to protect you. But we may also need to protect people from you.