They said to him, "We can."
"My chalice you will indeed drink,
but to sit at my right and at my left, this is not mine to give
but is for those for whom it has been prepared by my Father."
When the ten heard this,
they became indignant at the two brothers.
But Jesus summoned them and said,
"You know that the rulers of the Gentiles lord it over them,
and the great ones make their authority over them felt.
But it shall not be so among you.
Rather, whoever wishes to be great among you shall be your servant;
whoever wishes to be first among you shall be your slave.
-- Mt 20:20-28
Those who exercise authority should do so as a service. "Whoever would be great among you must be your servant." The exercise of authority is measured morally in terms of its divine origin, its reasonable nature and its specific object. No one can command or establish what is contrary to the dignity of persons and the natural law.
-- CCC 2235
Photo by Michael Krier: Saint James at Santiago de Compostela, Spain.