Who said "I don't work with others. I work alone."?

This quote is attributed to Batman (1989).

I don't work with others. I work alone. - Batman (1989)

"I don't work with others. I work alone."

Batman (1989) Solitude

"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."

"Sometimes being the best means being the loneliest."

"Solitude gives us time to reflect on what matters"

"I'm not good with people, never have been."

"I feel like I'm disappearing."