Dean and Sam in “Unfinished Business”

Dean

We've been down roads like this before, man. With Yellow Eyes, Lucifer, Dick Friggin Roman ... we both know where this ends: one of us dies. Or worse.

Sam

So you just up and decided it's going to be you.

Dean

I'm a grunt, Sam. You're not. You've always been the brains of this operation. And you told me yourself, you see a way out. You see a light at the end of this ugly ass tunnel. I don't. But I tell you what I do know, is that I'm going to die with a gun in my hand. Because that's what I have waiting for me, that's all I have waiting for me. I want you to get out. I wantyou to have a life, become a Man of Letters, whatever. You with a wife, kids, and grandkids, livin' til you're fat and bald and chugging Viagra. That is my perfect ending and it's the only one I'm gonna get. So I'm gonna do these trials and I'm gonna do them alone. End of story. You're staying here, I'm going out there. If landshark comes knocking, you call me. If you try to follow me, I'll put a bullet in your damn leg.