It's not a fucking game!..And it's not one you want to lose.

Tom Bishop: Don't tell me that. Don't fucking tell me that. You didn't look in his eyes. Don't tell me that!
Nathan Muir: He was your asset, somebody you use for information.
Tom Bishop: Ah, Jesus Christ, you just... You don't just trade these people like they're baseball cards! It's not a fucking game!
Nathan Muir: Oh, yes it is. It's exactly what it is. And it's no kid's game either. This is a whole other game. And it's serious and it's dangerous. And it's not one you want to lose.
Tom Bishop: Nathan, we killed this man. We used him and we killed him. Okay, than you got to help me understand this one. You got... Nathan, what are we doing here? And don't give me some bullshit about the greater good.
Nathan Muir: That's exactly what it's about. Because what we do is unfortunately very, very necessary. And if you're not willing to sacrifice scum like Schmidt for those that want nothing more than their freedom, then you better take a long hard look at your chosen profession my friend. Because it doesn't get any easier. You wanna walk? You wanna walk, walk.
Nathan Muir: You go off the reservation, I will not come after you.
Tom Bishop: Fuck your rules, Nathan.
Nathan Muir: Okay, but tonight they saved your life.