Think, for a moment, of the everyday miracle we know as photosynthesis. In photosynthesis light means life. In the presence of light, green plants convert water, carbon dioxide, and minerals into carbohydrates and oxygen. If there would be no light, there would be no photosynthesis. If there would be no photosynthesis, there would be no more life.
Light means life.
Light means life. This means Jesus is the source of life and the well-spring of being. All life comes from Jesus and stems from Jesus. If you want to live, to really live, you must turn to Christ. Jesus says this in a rather dark time of Israel's history.