Who said "I've never backed down from a challenge."?

This quote is attributed to Iron Man.

I've never backed down from a challenge. - Iron Man

"I've never backed down from a challenge."

Iron Man Courage

"I am Iron Man."

"Genius, billionaire, playboy, philanthropist."

"I'm not the one who should be worried."

"This is the most important thing I've ever done."

"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."