Who said "This cape... it's not just a symbol. It's a promise."?

This quote is attributed to Superman (DCEU).

This cape... it's not just a symbol. It's a promise. - Superman (DCEU)

"This cape... it's not just a symbol. It's a promise."

Superman (DCEU)

"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."