Supernatural, Season 1

Dean:
This is why. [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:
Ok, 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 Hailey and her brother] I mean, I figure our family's so screwed to hell; maybe we can help some others. Makes things a little more bearable. I'll tell you what else helps: Killing as many evil sons of bitches as I possibly can.