Who said "I've learned that even the darkest soul can change."?

This quote is attributed to Batman (1989).

I've learned that even the darkest soul can change. - Batman (1989)

"I've learned that even the darkest soul can change."

Batman (1989) Hope

"It's not who I am underneath, but what I do that defines me."

"I am vengeance, I am the night, I am Batman."

"Criminals are a superstitious and cowardly lot."

"I have one rule."

"Every day is a new opportunity."

"Hope is what gets us through difficult times."

"I'm not your enemy, kid. I'm trying to save you."

"Redemption is a long road."