You are right on about even most good people will do this "...fill their time with what they love to do if you let them". That is what separates great people from good people. How to go from good to great in this matter? Be observant of ones own self, extremely hard. As the saying goes "The eyes that can see the whole world can't see themselves without help of a mirror." If that is hard, go find a great mentor who will act as a mirror and help us see what we do as compared to what we need to do.