I didn't know him, but for this reason I came baptizing in water: that he would be revealed to Israel."

 With this passage John begins the narrative part of his gospel. In the prologue he has shown what he intends to do; he is writing his gospel to demonstrate that Jesus is the Mind, the Reason, the Word of God come into this world in the form of a human person. Having set down his central thought, he now begins the story of the life of Jesus. 