Mark 10: 42 - 45
42 And Jesus called them to him and said to them, "You know that those who are supposed to rule over the Gentiles lord it over them, and their great men exercise authority over them.
43 But it shall not be so among you; but whoever would be great among you must be your servant,
44 and whoever would be first among you must be slave of all.
45 For the Son of man also came not to be served but to serve, and to give his life as a ransom for many."

EWTN