So the first way of thinking about serving is as a means to imitate Christ, to live as he lived. But it's not only the call to imitate Christ that will lead us to serve, it's also the call to obey him. Not so with you. Instead, whoever wants to be great among you must be your servant, and whoever wants to be first must be slave of all. For even the Son of Man did not come to be served, but to serve and to give his life as a ransom for many.
Unbelievers gather to themselves perks of office.
Leadership among unbelievers is to the advantage of the leaders. What is being added here is the costliness of service. On the one hand, we will be blessed in serving. But on the other, the Son of Man came to serve and give his life as a ransom for many. It cost Jesus everything.