Those nations and kings that do not offer their service will face destruction; they will be brought to devastation.
In this context, the Church is both fortified and expanded, as the city of the Savior is built, with the help of Gentiles who contribute to its walls, preventing intruders and disbelief from finding a foothold. The term "foreigners" refers to the Gentile nations that genuinely contribute to the establishment of Christ’s Church, with their rulers and leaders standing in its presence. This can be interpreted both literally and spiritually. Literally, we see Roman authority yielding to Christ’s dominion, contributing to the construction of churches with public funds and enacting laws that protect against pagan persecution and heretical deceit. Spiritually, the exemplary among them—those filled with virtue, eloquence, and holiness—serve this cause, resuscitating what has been neglected, that He may once again extend His love due to His mercy.
It is also to be noted that what was once desolate and held captive by the Jewish people will find reconciliation through the calling of the Gentiles. Thus, the gates will remain perpetually open for those who wish to be saved; both the joy-filled and the sorrowful who seek to believe in Him shall freely enter. The treasures of the nations will be brought forth to it, and their rulers will serve it as captives. You will witness this when the most eloquent are drawn to faith in Christ, revealing how the wisdom of the learned becomes foolishness, and the insights of the wise are set aside, so that the foolishness of God may surpass human wisdom (1 Cor. 1).
Those who refuse to offer genuine and beneficial service to the Church, desiring only their growth or recognition in the apostolic faith, will face destruction along with the wicked, and all who reject God's presence will descend into desolation.