He uses a fascinating picture to show how different the kingdom of heaven is to all earthly kingdoms. Earthly rulers take pains to protect their honour and their dignity.
But what the Master is, the follower should be also. Therefore it is very inappropriate for the disciples to be arguing among themselves about who is the greatest. They are thinking like carnal men, and they have forgotten that the kingdom they now belong to is completely different in nature. That way of thinking is triggered by pride, and it cannot work in the presence of the Lord. They cannot bring their old attitudes with them into the kingdom of heaven. We need to leave behind those attitudes as things which are inferior, even sinful, and which do not belong as part of the new life. We should instead admire the far superior way in which heaven operates. Just as our Lord loses nothing by taking the role of a servant, neither do we. Greatness consists in other things besides those which carnal men admire, for God counts greatness to be found in gentleness, kindness, love, self-sacrifice. Who are we going to be examined by on the Day of Judgment? Not by the great ones of this world, but by the One who laid down his life for his people.
There are a number of factors which people on earth treat as markers of dignity. One of them is greater age, and indeed the Scripture says, ‘The hoary head is a crown of glory, if it be found in the way of righteousness’ (Proverbs 16:31), and Peter says, ‘Likewise, ye younger, submit yourselves unto the elder’ (1 Peter 5:5). But the Ancient of Days has come down to serve his people, and how then can those with a few extra earthly years decline to serve the younger? Similarly, he that is chief on earth should be happy to become a servant to lesser ones. This does not mean that earthly institutions are to be overthrown, and there should be no order in society – the words of Peter quoted above show that that is not the case – but it means that we cannot so rigidly cling onto the advantages that earthly pre-eminence gives us, that we cannot risk taking another role to help others.