'Batman': 41 Most Memorable Quotes From The Dark Knight Trilogy
A CRIMINAL IS NOT COMPLICATED

Henri Ducard: But a criminal is not complicated. What you really fear is inside yourself. You fear your own power. You fear your anger, the drive to do great or terrible things.
ON COMPASSION

Henri Ducard: Your compassion is a weakness your enemies will not share.
Bruce Wayne: That's why it's so important. It separates us from them.

"You either die a hero or you live long enough to see yourself become the villain."
YOU EITHER DIE A HERO...
Harvey Dent: You either die a hero or you live long enough to see yourself become the villain.
A BAD JOKE

Batman: You're garbage who kills for money.
—The Dark Knight (2008)
SOME MEN JUST WANT TO WATCH THE WORLD BURN
Alfred Pennyworth: With respect Master Wayne, perhaps this is a man that *you* don't fully understand, either. A long time ago, I was in Burma. My friends and I were working for the local government. They were trying to buy the loyalty of tribal leaders by bribing them with precious stones. But their caravans were being raided in a forest north of Rangoon by a bandit. So, we went looking for the stones. But in six months, we never met anybody who traded with him. One day, I saw a child playing with a ruby the size of a tangerine. The bandit had been throwing them away.
Bruce Wayne: So why steal them?
Alfred Pennyworth: Well, because he thought it was good sport. Because some men aren't looking for anything logical, like money. They can't be bought, bullied, reasoned, or negotiated with. Some men just want to watch the world burn.
A SMILE
The Joker: Let's put a smile on that face!
—The Dark Knight (2008)