Who said "Believe in yourself even when no one else does."?

This quote is attributed to Bloo.

Believe in yourself even when no one else does. - Bloo

"Believe in yourself even when no one else does."

Bloo Courage

"Dude, that's what I'm talking about!"

"Go ahead, make my day. Wait, wrong show."

"I'm the best imaginary friend ever created!"

"Mac, you gotta believe in yourself, man."

"Never let fear stop you from chasing your dreams."

"Courage is being afraid but doing it anyway."

"Sometimes you gotta do what you gotta do."

"Sometimes you have to be the monster to stop the monsters."