> I've never seen anyone reach great heights without being in control of their own feelings
Steve Jobs wasn't exactly known for being in control of his emotions. Musk, Gates, Ellison and Kalanick also have a reputation for exploding in rage from time to time.
When you look at history's greatest scientists or mathematicians you see a pretty similar picture. Newton? Erdos? Grothendieck? Diogenes? They weren't emotionally stable 9 to 5 guys. Quite the opposite.
People who reach great heights are rarely balanced people. "Everything in moderation" doesn't produce greatness. If history tells us anything it's that we are incredibly forgiving of the flaws of highly accomplished people.