It seems to be a law of nature, inflexible and inexorable, that those who will not risk cannot win.
I find that, once you get into a position where you can afford a pair of shoes and a decent level of living, success in itself is empty.
I remember Agassi playing Federer in Basel, Switzerland in 1998, and Andre was already saying at that time that Federer would be tough. Usually at the time players are 17, you can see if they will be great.