In the Book of Revelation we find a description of the state of the Christian church as it would be at its close and as it now is. We are told that those people from that church who were meant by the false prophet, the dragon, the whore, and the beasts were cast into hell. After this—after the completion of the Last Judgment, that is—it says the following:
I saw a new heaven and a new earth, because the first heaven and the first earth had passed away. Then I, John, saw the holy city Jerusalem, coming down from God out of heaven. And I heard a loud voice from heaven saying, “Behold, the tabernacle of God is among people, and he will dwell with them, and they will be his people. And God himself will be with them and be their God.” The one who sat on the throne said, “Behold, I am making all things new.” And he said to me, “Write, because these words are true and faithful.” (Revelation 21:1, 2, 3, 5)
The new heaven and the new earth that John saw after the first heaven and the first earth had passed away do not mean a new sky like the one we can see with our eyes, full of air and stars, or a new earth for us to live on, but a new kind of church in the spiritual world and a new kind of church in this earthly world.
Because the Lord, when he was in this world, made a new kind of church in both the spiritual and the earthly worlds, it says similar things in the prophets, namely, that a new heaven and a new earth were going to come into being at that time, as we find in Isaiah 65:17, 66:22, and elsewhere—which cannot therefore be understood to refer to the sky that we can see with our eyes and the earth that we live on.
“The spiritual world” means the world where angels and spirits live, and “the earthly world” means the world where we are living. On the recent founding of a new kind of church in the spiritual world and the eventual founding of a new kind of church in the earthly world, there is some information in the booklet Last Judgment [Sections 1–5] and more in the supplement to that work.
from The Lord, Section 62