 Christ did the same thing. Christ came to this earth to show us our need for him. He showed us our sin, to show us that we needed his gift of salvation. Light helps us to see where we're going. It helps us to avoid pitfalls. We go to the mirror in the morning. We turn on the light. Okay, turn the light back off. Why do we do that? So that we can see what needs to be fixed before we start the day. It makes manifest. It shows us. It helps us to know.