Who said "I've got the guts to do what others won't."?

This quote is attributed to Biff Tannen.

I've got the guts to do what others won't. - Biff Tannen

"I've got the guts to do what others won't."

Biff Tannen Courage

"I'm your density. I mean, your destiny."

"Make like a tree and get outta here!"

"Nobody calls me chicken!"

"You're my favorite girl, McFly."

"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."