Who said "I can't sleep if there's questions that need answering."?

This quote is attributed to Iron Man.

I can't sleep if there's questions that need answering. - Iron Man

"I can't sleep if there's questions that need answering."

Iron Man Perseverance

"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."

"Perseverance is the key to success."

"Don't give up on what you believe in."

"I've been through worse."

"You learn to live with the pain."