Augustine of Hippo

The church is the sun and the moon and the stars, to which it was said, "Fair as the moon, bright as the sun." By it our Joseph is adored in this world as in Egypt, when he is raised from humble to high estate.

Letter 199:39 ↗

Bede

Beautiful as the moon, chosen as the sun, etc. Beautiful as the moon, because illuminated by the Sun of righteousness, it passes through the night of this world, and floods it with the light of heavenly knowledge and evangelical way of life; chosen as the sun, because it receives the image of its same Creator and illuminator in itself, walking in all righteousness, holiness, and truth, and truly giving thanks to Him, because the light of Your face, Lord, has been signed upon us (Psalm IV). …

Commentary on the Song of Songs ↗

Bonaventure

Faith is a union of the Head with the body. The shining of light as related to faith is called allegory, and it is twofold, one directed to the Head and the other to the body. For there is one directed to the crucified Head, that was born, etc., and another directed to the body, that is, the Church, primitive, intermediate, and final. …

Collations on the Hexaemeron, Collation 2 ↗