Who said "I won't let you down. I can't."?

This quote is attributed to Superman (DCEU).

I won't let you down. I can't. - Superman (DCEU)

"I won't let you down. I can't."

Superman (DCEU) Courage

"I can't just ignore what's happening in the world. I have to act."

"You say that like it's a bad thing. Like hope is weakness."

"I grew up in Kansas. I have values."

"Some people can read Plutarch and Aristotle in the original Greek at age seven. Now he's doing algebra."

"Never let fear stop you from chasing your dreams."

"Courage is being afraid but doing it anyway."

"Sometimes you gotta do what you gotta do."

"Sometimes you have to be the monster to stop the monsters."