Here are some excerpts from Swedenborg's "Arcana Coelestia" that help explain the inner meaning of this chapter:

AC 1778. Here in the internal sense are continued the things concerning the Lord after He had endured in childhood the most severe combats of temptations, which were directed against the love which He cherished toward the whole human race, and in particular toward the church; and therefore being anxious concerning their future state a promise was made Him but it was shown at the same time what the state of the church would become toward its end when it would begin to expire; but that still a new church should revive, which would take the place of the former, and the heavenly kingdom would be immensely increased.

AC 1779. The Lord‘s consolation after the combats of temptations described (verse 1).

AC 1780. The Lord’s complaint respecting the church, that it was in externals only (verses 2, 3). A promise concerning an internal church (verse 4). Concerning its multiplication (verse 5). That the Lord is righteousness (verse 6). And unto Him alone belongs the kingdom in the heavens and on earth (verse 7).

AC 1781. And as He desired to be assured that the human race would be saved (verse 8), it was shown Him how the case is with the church, in general, specifically, and in particular (verses 9 to 17).

AC 1782. The "heifer," "she-goat," and "ram," are the representatives of the celestial things of the church; the "turtledove" and the "young pigeon" are the representatives of its spiritual things (verse 9). The church was on one side, and the Lord on the other (verse 10). The Lord would dissipate evils and falsities (verse 11). But the falsities would still infest it (verses 12, 13). From these there should be deliverance (verse 14). Thus the Lord received consolation (verse 15). But that evils would take possession (verse 16). And at last nothing hut falsities and cupidities would reign (verse 17). Then would come the Lord‘s kingdom, and a new church, the extension of which is described (verse 18). The falsities and evils to be expelled from it are the nations named (verses 19 to 21).

1782. The heifer, she-goat, and ram are representatives of the celestial things of the Church, while the turtle dove and the fledgling are representatives of the spiritual things of the same, verse 9. The Church was on one side, the Lord on the other, verse 10. The Lord would disperse evils and falsities, verse 11. But falsities would continue to infest it, verses 12-13. From those falsities there would be deliverance, verse 14, and so the Lord would experience comfort, verse 15. Evils however would take possession of it, verse 16, and in the end nothing but falsities and evil desires would reign there, verse 17. At this point the Lord's kingdom would come, and a new Church, the extension of which is described, verse 18. The falsities and evils that were to be expelled from it are the nations mentioned in verses 19-21.