The gospel of John is meant to prove that Jesus is God. Chapter 3 contains some of the most direct, most important concepts in Christianity. The ideas of spiritual rebirth, and the need to believe in Christ, are reinforced by the rest of the information in this gospel. John continues to use contrast, moving from the loud and public temple cleansing to the quiet of this conversation. After Jesus injects humility into a powerful leader, chapter 4 will transition again, as Jesus gives dignity to an outcast stranger.