Who said "Resilience is the ability to keep going."?

This quote is attributed to Superman.

Resilience is the ability to keep going. - Superman

"Resilience is the ability to keep going."

Superman

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

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

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

"Even in darkness, there is always hope."