 And then there's the claim that Jesus makes. He says, I am the light of the world. When he spoke these words to the people who were gathered in the temple that day, he was not just giving them a truth, he was fulfilling the Old Testament prophecy. Did you know the Old Testament prophesied that Jesus would be a light? Isaiah said it this way, I will keep you and give you as a covenant to the people, as a light to the Gentiles.