Sam, Dean and others in “Unfinished Business”

Sam

Until what? Tell me. Until what, Dean? Until I watch you become a demon again, until then? I can't do that, I won't do that.

Dean

Well then you'll just have to lock me up, bind me to the Bunker like you did last time.

Charlie

That doesn't solve anything.

Sam

Look jut let us translate the book, okay. if there is a cure we'll do it and deal with the consequences later. I can't lose you!

Dean

Really?

Sam

Yeah really.

Dean

You change your mind on that 'cause that's not what you said last time.

Sam

Come on man, you know I didn't mean-

Dean

This is my cross to bear Sam, mine. And that book is not the answer, now we gotta destroy it before it falls into the wrong hands, and that includes me!