This is a very interesting passage. First, we understand that the Navajo people believed in light defeating darkness. This is such a recurrent theme throughout history and it really reflects our ancestral fear of being in the dark, of being without actual light. Second, we learn that the intent of the light is bring purpose to the lives of those residing in the three levels of the world. It is interesting to hear this because without light, our days could not be as productive as they are, especially in modern times. Third, the three worlds sound a lot like earth, heaven, and hell, all of which are emphasized in religions across the world today. Lastly, I think it is a startling revelation that the Navajo believed in a spiritual world before the birth of the earth. This gives such incredible insight into the intelligence of these people, because for so long, people didn't understand the formation of the earth, let alone to believe something came before all of what we know today. This is very uncommon in most popularized religions.