1) Jesus declares himself to be the "Light of the world" and says that those who follow him will not walk in darkness but will have the light of life. 2) The Pharisees challenge Jesus' claim, but he asserts that his testimony is true because he knows where he came from and where he is going, unlike them. 3) Jesus explains that people love either the light, which is Jesus, or the darkness, which is Satan, and this love determines their eternal destiny. Those who do evil hate the light and live in spiritual darkness.