The purpose of spiritual light is to enable the child of God to overcome this dark, corrupt world. The word of God illuminates us to overcome aspects of our fallen nature progressively, bit by bit. Coming out of darkness into light is comparable to the transition from night to dawn. Twilight is a period or state of obscurity and ambiguity where our vision is impaired. Good eyesight is dependent upon a healthy diet. Danger lurks for a child of God who does not ingest mature spiritual food. "Woe unto them that call evil good, and good evil; that put darkness for light, and light for darkness; that put bitter for sweet, and sweet for bitter!" (Isaiah 5:20)