John 1:5-9; John 8:12

5 The light shines in the darkness, and the darkness can never extinguish it. 6 God sent a man, John the Baptist, 7 to tell about the light so that everyone might believe because of his testimony. 8 John himself was not the light; he was simply a witness to tell about the light. 9 The one who is the true light, who gives light to everyone, was coming into the world.
12 Jesus spoke to the people once more and said, “I am the light of the world. If you follow me, you won’t have to walk in darkness, because you will have the light that leads to life.”