Nobody can be perfect. For example if a person is a professional bowling player, it can always learn some new trick except simply throwing balls. Or if a person is a professional skydiver, it can always find new ways to jump with parachute. If somebody tells you that he (or she) has achieved the top, do not believe him (or her). It simply means that this person is lazy or arrogant. Or even both. You should always improve yourself. Find something you like the most and continue practicing until you became a professional. And then continue practicing again.