Dean and Sam in “Unfinished Business”

Dean

You were right.

Sam

About what?

Dean

I shouldn't have lied to you. I do remember everything that happened to me in the Pit. Everything.

Sam

So, tell me about it.

Dean

No. I won't lie anymore, but I'm not going to talk about it.

Sam

Dean, look, you can't just shoulder this thing alone. You've gotta let me help.

Dean

How? Do you really think that a little heart-to-heart, some sharing and caring, is gonna change anything? Hmm? Somehow... heal me? I'm not talking about a bad day here.

Sam

I know that.

Dean

The things that I saw.... there aren't words. There is no forgetting. There's no making it better. Because it is right here... forever. You wouldn't understand. And I could never make you understand. So I am sorry.