[baytrailcat]

I think you are missing the whole point here. This is as specific as he can get, being still applicable to everyone - "a man must choose a path which will let his ABILITIES function at maximum efficiency toward the gratification of his DESIRES". He also points out a man's desire is shaped by his circumstances and heredity. So there's no way he can "flesh out" details for anyone. That part can be done by the individual alone. This dictum gives you a tool to navigate your thought process and arrive at an answer on your own.