Success is a scary concept because it assumes something kind of final. In the grand scheme of life, I don't think there is some ultimate success.
Success is an absurd, erratic thing. She arrives when one least expects her and after she has come may depart again almost because of a whim.
It's success, not fame, that is quite addictive. I'm addicted to a lot of things and, as it happens, success is one of them.