Be extremely subtle, even to the point of formlessness. Be extremely mysterious, even to the point of soundlessness. Thereby you can be the director of the opponent's fate.
I think that everyone at any age should ask themselves, 'where do I want to be today, where do I want to be tomorrow, and where do I want to be in a hundred years?' We all have clear answers to those questions. We only have so much time. It's a real shame if we don't spend our lives trying to do that.