24 When the ten heard about this, they were indignant with the two brothers. 25 Jesus called them together and said, “You know that the rulers of the Gentiles lord it over them, and their high officials exercise authority over them. 26 Not so with you. Instead, whoever wants to become great among you must be your servant, 27 and whoever wants to be first must be your slave— 28 just as the Son of Man did not come to be served, but to serve, and to give his life as a ransom for many.” Matthew 20:24-28
Even with a perfect man amongst them, the disciples got angry and frustrated at James and John.
But Jesus’ point was that hierarchy in the kingdom of heaven is meaningless, except for the Trinity.
The Second Person of that Trinity was standing in front of them right now, and even He became their servant, taking on human flesh.
In other words, the kingdom is about service, even as leaders – especially as leaders.
A children’s song from days gone by sums it up:
If you want to be great in God’s kingdom,
Learn to be the servant of all.