Matt 20:25 But Jesus called them unto him, and said, Ye know that the princes of the Gentiles exercise dominion over them, and they that are great exercise authority upon them.
26 But it shall not be so among you: but whosoever will be great among you, let him be your minister;
27 And whosoever will be chief among you, let him be your servant:
28 Even as the Son of man came not to be ministered unto, but to minister, and to give his life a ransom for many.
The original disciples of Jesus did not have a good understanding of the nature of His kingdom and the leadership of it. I am not sure that nearly two thousand years down the road we have much more clarity about the matter. Read more