It was God's plan to fill the world with light in Genesis 1. It was God's plan to send Jesus as the light of the world in John 8. And in 1 John 1, John reminds Christians that it is God's plan for Christians to live and walk in that light through the death and resurrection of Jesus. The good news isn't that we should be in the light, but that we can be, that Jesus gives us a way of escaping sin and darkness.