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.–MARK ix. 33-37.
If there is in heaven a picture of that wonderful teaching, doubtless we shall see represented in it a dim childhood shining from the faces of all that group of disciples of which the centre is the Son of God with a child in his arms. The childhood, dim in the faces of the men, must be shining trustfully clear in the face of the child. But in the face of the Lord himself, the childhood will be triumphant–all his wisdom, all his truth upholding that radiant serenity of faith in his father. Verily, O Lord, this childhood is life. Verily, O Lord, when thy tenderness shall have made the world great, then, children like thee, will all men smile in the face of the great God.
But to advance now to the highest point of this teaching of our Lord: “He that receiveth me receiveth him that sent me.” To receive a child in the name of God is to receive God himself. How to receive him? As alone he can be received,–by knowing him as he is. To know him is to have him in us. And that we may know him, let us now receive this revelation of him, in the words of our Lord himself. Here is the argument of highest import founded upon the teaching of our master in the utterance before us.
God is represented in Jesus, for that God is like Jesus: Jesus is represented in the child, for that Jesus is like the child. Therefore God is represented in the child, for that he is like the child. God is child-like. In the true vision of this fact lies the receiving of God in the child.
Read much more here: http://www.online-literature.com/george-macdonald/unspoken-sermons/1/