How we cite our quotes: All quotations are from The Dark Knight.
Quote #1
BRUCE WAYNE: You know that day that you once told me about, when Gotham would no longer need Batman? It's coming.
RACHEL DAWES: Bruce. You can't ask me to wait for that.
BRUCE WAYNE: It's happening now. Harvey is that hero. He locked up half of the city's criminals, and he did it without wearing a mask. Gotham needs a hero with a face.
One of the reasons that Bruce became Batman was that the police and law enforcement in Gotham were thoroughly corrupt. (Gordon was the only cop worth trusting in Batman Begins.) With the virtuous Harvey, that justification is unnecessary, which means that Batman can trust the justice system to do right as long as Harvey's there.
Quote #2
THE JOKER: Who wants to join our team?
If you stop and think about it, the Joker actually does more damage to the mob than any of the good guys do. He kills Gambol, the Chechen and Mr. Lau directly, and Two-Face gets rid of Maroni after the Joker sends him over the edge. That's a lot of bad guys taken out, and he does so simply by ignoring Batman's One Rule. This guy has really thought his position through.
Quote #3
THE JOKER: Come on… I want you to do it, I want you to do it. Come on, hit me. HIT ME!!!
The Joker has more on his mind than a death wish here. He wants to show Batman that every rule gets broken. The question is, wouldn't killing the Joker be just? And if it is, then what, exactly, does Bruce gain by sticking to his one rule?