The Joker said (Interrogation Scene):

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Don't talk like one of them, you're not. Even if you want to be. To them, you're just a freak, like me. They need you right now. When they don't, they'll cast you out, like a leper. See their morals, their code, is a bad joke, dropped at the first sign of trouble. They're only as good as the world allows them to be. I'll show you, when the chips are down, these civilized people will eat each other. See, I'm not a monster, I'm just ahead of the curve.

The Joker said (Hospital Scene):

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Do I really look like a guy with a plan? You know what I am? I'm a dog chasing cars.. I wouldn't know what to do with one if I caught it. You know, I just do things. The mob has plans. The cops have plans. Gordon's got plans. They're schemers, schemers trying to control their little world. I'm not a schemer. I try to show the schemers how pathetic their attempts to control things really are. So, when I say, that you and your girlfriend was nothing personal, you know I'm telling the truth.

It's the schemers that put you where you are. You were a schemer. You had plans.. and look where that got you.

I just did what I do best. I took your little plan and I turned it on itself. Look what I did to this city with a few drums of gas and a couple of bullets. You know what I noticed? Nobody panics when things go according to plan. Even if the plan is horrifying. If tomorrow I tell the press that a gangbanger will get shot or a truck-ful of soldiers will be blown up. No one panics. Because it's all part of the plan. But when I say one little 'ol mayor will die, then everyone loses their minds. Introduce a little anarchy. Upset the established order and everything becomes chaos. I'm an agent of chaos. And you know the thing about chaos? It's fair.

The Joker said (Final Scene):

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You.. you just couldn't let me go, could you? This is what happens when an unstoppable force, meets an immovable object. You, truly are incorruptible, aren't you? You won't kill me, out of some, misplaced sense of self righteousness. And I, won't kill you, because you're just too much fun. I think you and I, are destined to do this forever.

Until their spirit breaks completely. Until they get a good look at the real Harvey Dent, and all the heroic things he's done. You didn't think I'd risk losing the battle for Gotham's soul in a fist fight with you? No.. you need an ace in the hole, mine's Harvey.

I took Gotham's white knight and I brought him down to our level. It wasn't hard.. see, madness as you know is like gravity. All it takes, is a little push.