Who said "I've made a promise, and I will keep it until my last breath."?

This quote is attributed to Batman (1989).

I've made a promise, and I will keep it until my last breath... - Batman (1989)

"I've made a promise, and I will keep it until my last breath."

Batman (1989) Perseverance

"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."

"Perseverance is the key to success."

"Don't give up on what you believe in."

"I've been through worse."

"You learn to live with the pain."