Basil of Caesarea

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? …

The Hexaemeron, Homily 2: The Earth Was Invisible and Unfinished ↗

Ambrose of Milan

God, as judge of the whole work, foreseeing what is going to happen as something completed, commends the part of his work which is still in its initial stages, being already cognizant of its termination.

The Six Days of Creation ↗

Bede

And God saw the light, that it was good. Not as if suddenly seeing the light previously unknown did He praise it, because He says it is good; but He declared that it, which He knew would be praiseworthy once created, was already worthy of praise and admiration by men. Indeed, because He did not completely dispel the darkness of the world by infusing light (for it is the privilege of the heavenly realm to enjoy fixed and perpetual light), but by illuminating one part, He left the other dark, it is rightly added:

Commentary on Genesis (Hexaemeron) ↗

Bonaventure

"God saw the light that it was good; and He divided the light from the darkness." The passage, "God saw the light," is quoted on account of the first vision of the intelligence, which is infused by nature. It means that God made it possible to see. This has been covered in the two preceding collations by considering the sciences, in that the light shines as the truth of things, the truth of words, and the truth of moral acts. …

Collations on the Hexaemeron, Collation 6 ↗