Dean and Sam in “Unfinished Business”

Dean

That is not how you yell like that. [holds up their dad's journal] This book. This is Dad's single most valuable possession. Everything he knows about every evil thing is in here. And he's passed it on to us. I think he wants us to pick up where he left off, you know, saving people, hunting things — the family business.

Sam

That makes no sense. Why, why doesn't he just call us? Why doesn't he tell us what he wants; tell us where he is?

Dean

I dunno. But the way I see it, Dad's given us a job to do and I intend to do it.

Sam

Dean, no. I gotta find Dad. I gotta find Jessica's killer. It's the only thing I can think about.

Dean

Okay, alright, Sam; we'll find them, I promise. Listen to me. You've gotta prepare yourself. I mean, this search could take a while, and all that anger, you can't keep it burning over the long haul, it's gonna kill you. You gotta have patience, man.

Sam

How do you do it? How does Dad do it?

Dean

Well, for one, them. [looks over at Haley and her brother] I mean, I figure our family's so screwed to hell; maybe we can help some others. Makes things a little bit more bearable. I'll tell you what else helps: killing as many evil sons of bitches as I possibly can.