'The first resurrection,' mentioned in Revelation 20:5, 6, does not mean a first resurrection, but the essence and primary part of resurrection, which is salvation and eternal life. There is only one resurrection to life. A second does not happen, and is not mentioned anywhere in the Bible.

(References: Apocalypse Explained 6; Apocalypse Revealed 851; Revelation 20:5-6)

18. VI. FROM THIS NEW HEAVEN THE LORD JEHOVIH DERIVES AND PRODUCES A NEW CHURCH ON EARTH, WHICH TAKES PLACE BY MEANS OF A REVELATION OF TRUTHS FROM HIS MOUTH, OR FROM HIS WORD, AND BY INSPIRATION. It is written that John:

"Saw the holy city, New Jerusalem, descending from God out of heaven, prepared as a bride adorned for her husband". (Rev. 21:2).

By the holy city, New Jerusalem, is meant the doctrine of the New Church, consequently the Church as to doctrine; and by Jerusalem descending from God out of the new heaven, is meant that the true doctrine of the Church is from no other source. That the doctrine descended, is because a Church is a Church from doctrine and according to it; apart from doctrine, a Church is no more a Church than a man is a man without members, viscera and organs, thus from the mere covering of skin, which only defines his external shape; nor any more than a house is a house without bed-chambers, dining-rooms and articles of use within, thus from the wall and arched roof alone. The case is similar with the Church apart from doctrine. That Jerusalem signifies the Church with respect to doctrine, may be seen proved from the Word in the work itself, THE TRUE CHRISTIAN RELIGION (n. 782). From these things, it is manifest that the Church on earth is derived and produced by the Lord by means of the angelic heaven.