It shall be established forever as the moon, and as a faithful witness in heaven.
Read Chapter 89
Augustine of Hippo
32. Listen for thy confirmation in hope, for thy security, if thou knowest thyself to be among the members of Christ. "I have sworn once by My holiness that I will not lie unto David" (ver. 35). Dost thou wait till God swear a second time? How often is He to swear, if in one oath He is false? One oath He made for our life, who sent His Only One to die for us. "I have sworn once by My holiness, that I will not lie unto David." "His seed shall endure for ever" (ver. 36). His seed endures for ever; because the Lord knows them that are His. "And His seat is like as the sun before me:" "and as the moon perfect for evermore: and the faithful witness in heaven" (ver. 37). They are His seat, in whom He sits and reigns. But if His seat, His members also; because even our members are the seat of our head. See how all our other members sustain our head: but the head supports nothing above itself, but is itself supported by the rest of our limbs, as if the whole body of a man were the seat of his ...
Witness. Which may refer to the throne, or to the sun, (Calmet) or to the rainbow. (Berthier) (Du Hamel)
As long as the stars subsist, so long shall his throne be established. (Calmet)
The Church shines like the sun, and is easily known. (Berthier)
God, (Eusebius) or Christ, attests the promises. (St. Jerome) (Isaias lv. 4., and Apocalypse i. 5.)
The rainbow was assigned as a memorial, that the world should no more be drowned, Genesis ix. The other covenants made by God have no less stability. (Haydock)
Christian souls may shine in virtue, like the sun, or full moon, (Worthington) particularly (Haydock) after the resurrection, when they will be perfect, and not liable to change. (St. Augustine)