38 Henceforward, as if through prophecy all things had been discoursed of which now we see fulfilled, he exhorts to the praise of Christ, and next He foretells His future Advent. “Kingdoms of earth, sing ye to God, psalm ye to the Lord: psalm ye to God, who has ascended above the Heaven of Heavens to the East”. Or, as some copies have it, “who has ascended above the Heaven of Heaven to the East.” In these words he perceives not Christ, who believes not His Resurrection and Ascension. But has not “to the East,” which he has added, expressed the very spot; since in the quarters of the East is where He rose again, and whence He ascended? Therefore above the Heaven of Heaven He sits at the right hand of the Father. This is what the Apostle says, “the Same is He that has ascended above all Heavens.” For what of Heavens does remain after the Heaven of Heaven? Which also we may call the Heavens of Heavens, just as He has called the firmament Heaven: which Heaven, however, even as Heavens we read of, in the place where there is written, “and let the waters which are above the Heavens praise the name of the Lord.” And forasmuch as from thence He is to come, to judge quick and dead, observe what follows: “behold, He shall give His voice, the voice of power.” He that like a lamb before the shearer of Him was without voice, “behold shall give His voice,” and not the voice of weakness, as though to be judged; but “the voice of power,” as though going to judge. For God shall not be hidden, as before, and in the judgment of men not opening His mouth; but “God shall come manifest, our God, and He shall not be silent.” Why do ye despair, you unbelieving men? Why do ye mock? What says the evil servant? “My Lord delays to come.” “Behold, He shall give His voice, the voice of power.”
39. “Give ye glory to God, above Israel is the magnificence of Him”. Of whom says the Apostle, “Upon the Israel of God.” For “not all that are out of Israel, are Israelites:” for there is also an Israel after the flesh. Whence he says, “See ye Israel after the flesh.” “For not they that are sons of the flesh, are sons of God, but sons of promise are counted for a seed.” Therefore at that time when without any intermixture of evil men His people shall be, like a heap purged by the fan, like Israel in whom guile is not, then most pre-eminent “above Israel” shall be “the magnificence” of “Him: and the virtue of Him in the clouds.” For not alone He shall come to judgment, but with the elders of His people: to whom He has promised that they shall sit upon thrones to judge, who even shall judge angels. These be the clouds.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)