Light is important. God created light on the first day. Jesus is the Light of the World. We turn on a light so that we can see. Some want to hide the Gospel light, but it cannot be hidden. Some want to hide their actions in darkness, but that does not work either.
God's light reveals the truth. The darkness cannot overcome it. God's love for all people is revealed. The evil deeds done in darkness will be exposed. We need to walk in the light.