The art of leadership is in the ability to make people want to work for you, while they are really under no obligation to do so. Leaders are people, who raise the standards by which they judge themselves and by which they are willing to be judged. The goal chosen, the objective selected, the requirements imposed, are not mainly for their followers alone.
They develop with consumate energy and devotion, their own skill and knowledge in order to reach the standard they themselves have set.
This whole-hearted acceptance of the demands imposed by even higher standards is the basis of all human progress. A love of higher quality, we must remember, is essential in a leader.

Speech on Leadership in Speeches Delivered on Various Occasions, May 1957-December 1959 (1960), p. 138

Selassie's speech on Leadership