And God saw the light, that it was good: and God divided the light from the darkness.
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Basil the Great
How can we worthily praise light after the testimony given by the Creator to its goodness? The word, even among us, refers the judgment to the eyes, incapable of raising itself to the idea that the senses have already received. But, if beauty in bodies results from symmetry of parts, and the harmonious appearance of colours, how in a simple and homogeneous essence like light, can this idea of beauty be preserved? Would not the symmetry in light be less shown in its parts than in the pleasure and delight at the sight of it? Such is also the beauty of gold, which it owes not to the happy mingling of its parts, but only to its beautiful colour which has a charm attractive to the eyes.
Thus again, the evening star is the most beautiful of the stars: not that the parts of which it is composed form a harmonious whole; but thanks to the unalloyed and beautiful brightness which meets our eyes. And further, when God proclaimed the goodness of light, it was not in regard to the charm of the eye but as a provision for future advantage, because at that time there were as yet no eyes to judge of its beauty. And God divided the light from the darkness; (Genesis 1:4) that is to say, God gave them natures incapable of mixing, perpetually in opposition to each other, and put between them the widest space and distance.