Dean Winchester: 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 Winchester: How do you do it? How does Dad do it?

Dean Winchester: Well, for one, them. 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 b*tches as I possibly can.