Bede the Venerable
Catena Aurea · Markusevangelium 9
And they departed thence, and passed through Galilee; and he would not that any man should know it. For he taught his disciples, and said unto them, The Son of man is delivered into the hands of men, and they shall kill him; and after that he is killed, he shall rise the third day. But they understood not that saying, and were afraid to ask him. And he came to Capernaum: and being in the house he asked them, What was it that ye disputed among yourselves by the way? But they held their peace: for by the way they had disputed among themselves, who should be the greatest. And he sat down, and called the twelve, and saith unto them, If any man desire to be first, the same shall be last of all, and servant of all. And he took a child, and set him in the midst of them: and when he had taken him in his arms, he said unto them, Whosoever shall receive one of such children in my name, receiveth me: and whosoever shall receive me, receiveth not me, but him that sent me.
(ubi sup.) The reason why the dispute concerning the chief place arose amongst the disciples seems to have been, that Peter, James, and John, were led apart from the rest into the mountain, and that something secret was there entrusted to them, also that the keys of the kingdom of heaven were promised to Peter, according to Matthew. Seeing however the thoughts of the disciples, the Lord takes care to heal the desire of glory by humility; for He first, by simply commanding humility, admonishes them that a high station was not to be aimed at. Wherefore it goes on: And he sat down, and called the twelve, and saith unto them, If any man desire to be first, the same shall be last of all, and servant of all.