Ambrose of Milan
Catena Aurea · Lukasevangelium 22
And there was also a strife among them, which of them should be accounted the greatest. And he said unto them, The kings of the Gentiles exercise lordship over them; and they that exercise authority upon them are called benefactors. But ye shall not be so: but he that is greatest among you, let him be as the younger; and he that is chief, as he that doth serve. For whether is greater, he that sitteth at meat, or he that serveth? is not he that sitteth at meat? but I am among you as he that serveth.
But it must be observed, that not every kind of respect and deference to others betokens humility, for you may defer to a person for the world’s sake, for fear of his power, or regard to your own interest. In that case you seek to advance yourself, not to honour another. Therefore there is one form of the precept given to all men, namely, that they boast not about precedence, but strive earnestly for humility.