God is the light of the heavens and the earth. A metaphor for His light is a niche in which there is a lamp placed in a glass. The glass is like a shining star which is lit from a blessed olive tree that is neither eastern nor western. Its oil almost lights up even though it has not been touched by the fire. It is light upon light. God guides to His light whomever He wants. God uses various metaphors. He has the knowledge of all things.