In her book Dare to Serve, Cheryl Bachelder states that "it is easy to say that you want to serve others well, but it is much harder to do so in daily life. This topic is seldom discussed out in the open. It would not be seen as admirable to admit that your leadership approach is aimed at serving yourself well. In fact, I've never heard anyone actually say this out loud." Based on his writings, 

how might Robert Greenleaf respond to this challenge of a leader's motivation that Cheryl addresses?