Many people have a fear of the dark or, more specifically, they fear what might be lurking in the dark. In our modern life, the way to remove darkness from a room is to simply flip a light switch. Think about it for a moment, the light comes on and automatically the darkness is gone. Now ask yourself, what would it be like if we had to have the ability to first move the darkness out of the room before the light could do it’s work? The idea is almost mind bending and the task beyond our human limits. If this were the task, we would simply have no light.
Throughout the Gospels, especially the Book of John, Jesus spent a lot of time talking about how he is the light of the world. His spiritual light works very much like our modern light switch, it can cause light to flood our lives and replace all darkness. This had not always been true. Before the life and death of Jesus Christ, those who followed God had to try and manually remove the darkness from their hearts. Maybe this was through sacrifices, fasting, prayer, or an attempt at strict adherence to the Ten Commandments. But, just as we would find it impossible to remove darkness from a room, they too found it impossible to fully remove sin from their lives.
That is why the light which Jesus Christ offers is so essential. His sacrifice of love created a light that was not dependent on human knowledge, efforts, or ability. Another passage in John says “God is light; in Him there is no darkness at all” or more famously “A light shines in the darkness, and the darkness did not overcome it”. The light given by Jesus changes the whole challenge of light versus dark. No longer are we asked to move the darkness out before the light can get in. Now we are promised that through Jesus Christ the light is permanently on and the darkness has lost its place.