Who said "A man can change his nature. The question is: should he?"?

This quote is attributed to Batman (1989).

A man can change his nature. The question is: should he? - Batman (1989)

"A man can change his nature. The question is: should he?"

Batman (1989) Change

"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."

"Change brings new opportunities."

"Every day is a new opportunity."

"Healing doesn't mean forgetting."

"You either get better or you get bitter."