Origen

“ But he who has received the little child, and the Saviour, and Him that sent Him, is least of all the disciples of Jesus, making himself little. But, so far as he belittles himself, to that extent does he become great; as that very thing, which caused him the more to make himself little, contributes to his advance in greatness ”

“ And perhaps here those who receive the kingdom of God receive it, when it is as a little child, but in the world to come no longer as a little child; and they receive the greatness of the perfection in the spiritual manhood, so to speak, which perfection is manifested to all who in the present time receive it, when it is here as a little child. ”

“ Wherefore He sat down, and called them, and teaches who is the greatest, saying, that he who became last of all by means of his moderation and gentleness, would as the greatest obtain the first place, so that he did not receive the place of one who was being ministered unto, but the place of one who ministered, and that not to some but not to others, but to all absolutely; for attend to the words, “If any man would be first he shall be last of all, and minister of all.” ”