Dean and Sam in “Unfinished Business”

Dean

I'm sorry.

Sam

You -- For what?

Dean

The way I've been acting. And for Dad. I mean, he was your dad too. And it's my fault that he's gone.

Sam

What are you talking about?

Dean

I know you've been thinking it, so have I. Doesn't take a genius to it figure out. Back at the hospital, I made a full recovery. It was a miracle. And five minutes later Dad's dead and the Colt's gone.

Sam

Dean.

Dean

You can't tell me that there's not a connection there. I don't know how the demon was involved. I don't know how the whole thing went down exactly. But Dad's dead because of me. And that much I do know.

Sam

We don't know that. Not for sure.

Dean

Sam ... [He starts to cry] You and Dad ... you're the most important people in my life. And now... I never should've come back, Sam. It wasn't natural. And now look what's come of it. I was dead. And I should have stayed dead. You wanted to know how I was feeling. Well, that's it.

Dean

So tell me. What could you possibly say to make that all right?