to say that He is this light perceived by sight. Several considerations demonstrate this:

First, He, Most High, did not say that He is light, but rather that He is the Light of the heavens and the earth, in the sense of perceptible illumination. If He were light in His very essence, this attribution would serve no purpose.

Second, if His being the Light of the heavens and the earth meant perceptible illumination, there would necessarily be no darkness whatsoever anywhere in the heavens or the earth, for He, Most High, is everlasting, never ceasing to be or passing away.

Third, if He, Most High, were light in the sense of illumination, that illumination would necessarily render the light of the sun, the moon, and fire unnecessary. Yet sensory perception demonstrates the contrary.