Children are the gift of God, they are a witness of the creative power of God, and ultimately a servant in His kingdom. Jesus gave this most powerful object lesson of a child to His disciples.

Mark 9: 36-37 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."