God is the light of the heavens and the earth. The semblance of His light is that of a niche in which is a lamp, the flame within a glass, the glass a glittering star as it were, lit with the oil of a blessed tree, the olive, neither of the East nor of the West, whose oil appears to light up even though fire touches it not, – light upon light.1 God guides to His light whom He will. So does God advance precepts of wisdom for men, for God has knowledge of everything.