Jesus is the Light of the World. That assumes that there is darkness first. We need God to shed light on the world, events, natural mysteries, etc. Otherwise, it is so easy to get lost nowadays. There are other creatures peddling their own stuff on the Internet, for example. All of them selling to us their wares for us to buy into them, to imitate them, etc. so we can get a sense or hold of our lives. Jesus proposes to us Himself as the Light we need.
