Supernatural, Season 4

Dean:
So what? God's my copilot is that it? Castiel just looks at him, and Dean glances over again. Well, you're a regular chatty Kathy. Tell me something, Sam would have wanted in on this, why not bring him back?

Castiel:
You had to do this alone, Dean.

Dean:
And you don't care that he's tearing up the future looking for me right now?

Castiel:
Sam's not looking for you.

Dean:
Alright, if I do this, then the family curse breaks right? Mom and Dad live happily ever after, and- and, Sam and I grow up playing little league and chasing tail?

Castiel:
You realize, if you do alter the future, your father, you, Sam, you'll never become hunters. And all those people you saved, they'll die.

Dean:
I realize.

Castiel:
And you don't care?

Dean:
Oh, I care. I care a lot, but these are my parents, I'm not gonna let them die again. I can't, no, not if I can stop it.