Who said "I train my body, but I train my mind harder."?

This quote is attributed to Batman (1989).

I train my body, but I train my mind harder. - Batman (1989)

"I train my body, but I train my mind harder."

Batman (1989) Education

"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."

"Education opens doors."

"Education opens doors to endless possibilities."

"I ain't got the education you got, bub."

"You can't put a price on history."