Who said "The work worth doing is rarely the easiest work."?

This quote is attributed to Superman.

The work worth doing is rarely the easiest work. - Superman

"The work worth doing is rarely the easiest work."

Superman Work

"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."

"Hard work never killed anybody."

"Work with purpose and integrity."

"Hard work pays off in the end."

"A man's gotta do what a man's gotta do."