Who said "The path of the righteous is often walked alone."?

This quote is attributed to Batman (1989).

The path of the righteous is often walked alone. - Batman (1989)

"The path of the righteous is often walked 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."