Who said "Hard work pays off when you believe in yourself."?

This quote is attributed to Courage the Cowardly Dog.

Hard work pays off when you believe in yourself. - Courage the Cowardly Dog

"Hard work pays off when you believe in yourself."

Courage the Cowardly Dog Work

"Courage, the cowardly dog."

"What's wrong, Muriel?"

"Oh, the things I do for love."

"Stupid Eustace!"

"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."