Revelation 21:24; The Nations
Revelation 21:24 (KJV) And the nations of them which are saved shall walk in the light of it: and the kings of the earth do bring their glory and honour into it.
The “nations” composed of saved people who survive the millennial kingdom without dying and without joining Satan’s rebellion and who undergo some sort of transformation that suits them for life in the eternal state. They will be like Adam and Eve in the Garden prior to the Fall (cf. Govett, Seiss). They will be unresurrected human beings who will inhabit the earth. Paradise restored (Revelation 22:1-5), throughout eternity.
Revelation 22:1-5 (KJV) And he shewed me a pure river of water of life, clear as crystal, proceeding out of the throne of God and of the Lamb. In the midst of the street of it, and on either side of the river, was there the tree of life, which bare twelve manner of fruits, and yielded her fruit every month: and the leaves of the tree were for the healing of the nations. And there shall be no more curse: but the throne of God and of the Lamb shall be in it; and his servants shall serve him: And they shall see his face; and his name shall be in their foreheads. And there shall be no night there; and they need no candle, neither light of the sun; for the Lord God giveth them light: and they shall reign for ever and ever.
These will be the ones over whom God’s resurrected saints will reign (Revelation 22:5). Nations, peoples, and men on earth must continue in the flesh as Adam and Eve did before the Fall (Seiss).
What conditions prevail outside the new Jerusalem in parts of the new earth from which the nations and the kings come to the city is not a matter of revelation. One can only assume that in the absence of the curse that plagued the former earth (Revelation 22:3), conditions will be vastly superior to the world in the present order. Two features are certain: there will be no more sea (Revelation 21:1) and no more night (Revelation 21:25).
Revelation 21:1 (KJV) And I saw a new heaven and a new earth: for the first heaven and the first earth were passed away; and there was no more sea.
Revelation 21:25 (KJV) And the gates of it shall not be shut at all by day: for there shall be no night there.