Christian wallpaper Genesis 1:16
Both lights are needful. Light and dark must exist to distinguish between day and night. Many like to follow after the lessor, let us however strive to follower after the greater. 

This is why people are condemned: The light came into the world. Yet, people loved the dark rather than the light because their actions were evil. People who do what is wrong hate the light and don’t come to the light. They don’t want their actions to be exposed. But people who do what is true come to the light so that the things they do for God may be clearly seen. John 3:19-21 (GW)