How Different the Acts in the Kingdom of the Earthly Jerusalem are from Those Which God Had Promised, So that the Truth of the Promise Should Be Understood to Pertain to the Glory of the Other King and Kingdom
That it might not be supposed that a promise so strongly expressed and confirmed was fulfilled in Solomon, as if he hoped for, yet did not find it, he says, “But You have cast off, and have brought to nothing, O Lord.” This truly was done concerning the kingdom of Solomon among his posterity, even to the overthrow of the earthly Jerusalem itself, which was the seat of the kingdom, and especially the destruction of the very temple which had been built by Solomon. But lest on this account God should be thought to have done contrary to His promise, immediately he adds, “You have delayed Your Christ.” Therefore he is not Solomon, nor yet David himself, if the Christ of the Lord is delayed.
For while all the kings are called His christs, who were consecrated with that mystical chrism, not only from king David downwards, but even from that Saul who first was anointed king of that same people, David himself indeed calling him the Lord's christ, yet there was one true Christ, whose figure they bore by the prophetic unction, who, according to the opinion of men, who thought he was to be understood as come in David or in Solomon, was long delayed, but who, according as God had disposed, was to come in His own time.
The following part of this psalm goes on to say what in the meantime, while He was delayed, was to become of the kingdom of the earthly Jerusalem, where it was hoped He would certainly reign: “You have overthrown the covenant of Your servant; You have profaned in the earth his sanctuary. You have broken down all his walls; You have put his strong-holds in fear. All that pass by the way spoil him; he is made a reproach to his neighbors. You have set up the right hand of his enemies; You have made all his enemies to rejoice.
You have turned aside the help of his sword, and have not helped him in war. You have destroyed him from cleansing; You have dashed down his seat to the ground. You have shortened the days of his seat; You have poured confusion over him.” All these things came upon Jerusalem the bond woman, in which some also reigned who were children of the free woman, holding that kingdom in temporary stewardship, but holding the kingdom of the heavenly Jerusalem, whose children they were, in true faith, and hoping in the true Christ. But how these things came upon that kingdom, the history of its affairs points out if it is read.
Source: City of God (New Advent)