Who said "It's not who I am underneath, but what I do that defines me."?

This quote is attributed to Superman.

It's not who I am underneath, but what I do that defines me. - Superman

"It's not who I am underneath, but what I do that defines me."

Superman Wisdom

"I'm here to fight for truth and justice, and all that stuff."

"The world doesn't need a savior, but it could use a friend."

"Even in darkness, there is always hope."

"My father believed that if the world found out who I really was, they'd reject me. He was wrong."

"I'm not angry, I'm just disappointed."

"The best things in life are free."

"You can't have everything in life, but you can have what matters most."

"A woman's intuition is rarely wrong."