Light
In the Name of God, the Merciful, the Compassionate[24:35]
God is the Light of the heavens and the earth; the likeness of His Light is as a niche wherein is a lamp (the lamp in a glass, the glass as it were a glittering star) kindled from a Blessed Tree, an olive that is neither of the East nor of the West whose oil wellnigh would shine, even if no fire touched it; Light upon Light; (God guides to His Light whom He will.) (And God strikes similitudes for men, and God has knowledge of everything.)