Dean and Sam in “Unfinished Business”

Dean

So, pit stop at Mount Doom?

Sam

Dean-

Dean

Sam, let's not.

Sam

No, listen, this is important. I know you don't trust me. Just, now I realize something. I don't trust me either. From the minute I saw that blood, the only thought in my head... And I tell myself it's for the right reasons, that my intentions are good, and it- it feels true, you know? But I think, underneath... I just miss the feeling. I know how messed up that sounds, which means, I know how messed up I am. The thing is, the problem's not the demon blood, not really, I mean, I- what I did, I can't blame the blood, or Ruby, or... anything. The problem's me. How far I'll go. There's something in me that... scares the hell outta me, Dean. In the last couple of days, I caught another glimpse.

Dean

So what are you saying?

Sam

I'm in no shape to be hunting. I need to step back, 'cause I'm dangerous. Maybe it's best we just go our separate ways.

Dean

Well I think you're right.

Sam

I was expecting a fight.

Dean

The truth is, I spend more time worrying about you, than about doing the job right. I just can't afford that, you know? Not now.

Sam

I'm sorry, Dean.

Dean

I know you are, Sam. Hey, you, uh... wanna take the Impala?

Sam

It's okay. [gets up to leave] Take care of yourself, Dean.

Dean

Yeah, you too, Sammy.