That definition is simply this: Leadership is the art of getting people to want to do what must be done.
Notice three things about this definition. First, as a leader, it’s your responsibility to figure out what must be done. You might do this by your own insight and instinct or, more likely, via dialogue and debate with the right people; but however you do it, you need to get clear. Second, it’s not about getting people to do what must be done but about getting them to want to do it. Third, it’s not a science; it’s an art.