Cyril of Alexandria

One of the prophets rightly spoke of this relation to those who had fallen into negligence: “Be gathered again and tied back together, you undisciplined nation, before you become like the flower that passes away.” A disciple can also be said to “attach” himself to a teacher in terms of a love of study, and we too can attach ourselves to one another not in one fashion only but in many. In short, when someone assists another in a task, should we not consider that he has been conjoined by will to the one who receives his assistance? It seems to us that this is exactly what these innovators mean by conjunction. You must have heard how they stupidly maintain that God the Word assumed a man, as if he were a different Son to himself, and then proposed him as a kind of assistant to his designs so that he underwent the trial and death, came to life again, rose up to heaven, and even sat upon the throne of the ineffable Godhead? With arguments such as these have they not completely and utterly proven that this man is altogether different from the true and natural son?

As far as the deeper meaning of the passage is concerned, it clearly commands Jerusalem to rejoice exceedingly, to be especially glad, to cheer up wholeheartedly as its trespasses are wiped out, evidently through Christ.

The spiritual and holy Zion—that is, the church, the holy multitude of the believers—is justified in Christ and only in him. By him and through him we are also saved as we escape from the harm of the invisible enemies, for we have a Mediator who was incarnated in our form, the king of all, that is, the Word of God the Father. Thanks to him, we do not see evil anymore, for we have been delivered from the powers of evil. He [the Word] is the armor of good will, the peace, the wall, the one who bestows incorruption, the arbiter of the crowns, who shut down the war of the incorporeal Assyrians and made void the schemes of the demons.