Scientists tell us that if you take six molecules of carbon dioxide and combine it with twelve molecules of water, then add light, the result will be one molecule of glucose sugar, six molecules of oxygen, and six molecules of water.
We know this process as photosynthesis and it makes the world as we know it possible. Carbon dioxide, which is exhaled by all mammals, is converted by plants into oxygen which allows us to breathe. But, photosynthesis without light is not possible.
With light, life becomes possible.
Just as the world needs a recipe to sustain its life, we equally need a formula to discover and attain the eternal life which is God's promise to all who believe. Jesus says: I am the light of not just of the world but all of eternity.