When I taught in a boy's prep school, I used to talk to the boys who were trying to make up their minds as to what their careers were going to be. A boy would come to me and ask, 'Do you think I can do this? Do you think I can do that? Do you think I can be a writer?' 'Oh' I would say, 'I don't know. Can you endure ten years of disappointment with nobody responding to you, or are you thinking that you are going to write a best seller the first crack? If you have the guts to stay with the thing you really want, no matter what happens, well, go ahead.'