Batman Begins2005

Ducard:
You're stronger than your father.

Bruce Wayne:
You didn't know my father.

Ducard:
But I know the rage that drives you. That impossible anger strangling the grief, until the memory of your loved ones is just poison in your veins. And one day, you catch yourself wishing the person you loved had never existed, so you'd be spared your pain. I wasn't always here in the mountains. Once I had a wife, my great love. She was taken from me. Like you, I was forced to learn that there are those without decency that must be fought without hesitation, without pity. Your anger gives you great power, but if you let it, it will destroy you, as it almost did me.

Bruce:
What stopped it?

Ducard:
Vengeance.

Bruce:
That's no help to me.

Ducard:
Why, Bruce? Why did you not avenge your parents?