Whatever makes you believe this is true?
Imagine two successful people. One of them, say, Bill Gates, is a very happy guy. He pursued a path that was natural for him and, while competitive, won because he ran after something he wanted. The other of them, say, Carl Icahn, is not a happy guy. I guess you could say he pursues something, like other people's companies, but not because he was born to do it, but because he is afraid. You could say he is running away from something, rather than pursuing something. He is looking over his shoulder so much you wonder why he doesn't run into walls more often.
Both men are bold. Both are successful. But one is forward thinking and forward looking. The other is afraid of failure, looking behind him to see what the competition is up to. Overachievers suffer from this malady all the time, finding their top-tier schools and prestigious careers strangely unsatisfying. Always measuring themselves or wanting others to give them a good grade.They will never, ever know peace.