In a flash of certainty, I saw that of one's motives are wrong, nothing can be right. It makes no difference whether you are a mailman, a hairdresser, an insurance salesman, a housewife -- whatever. As long as you feel you are serving others, you do the job well. When you are concerned only with helping yourself, you do it less well --a law as inexorable as gravity.
- Arthur Gordon on Servanthood
A Scrum Master is described as a servant leader, someone who's purpose is to lead a team in applying the SCRUM agile methodology but from a position of helping the team do well rather than helping themselves build an empire. To do the job well, ensure your motivation is right.