'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)

694. Just as heaven, deriving as it does from the Lord, constitutes through mutual love one human being and one soul so to speak, and consequently has one end in view, which is to preserve and save all men eternally, so conversely does hell, deriving as it does from the proprium, constitute through self-love and love of the world, that is, through hatred, one devil and one frame of mind (animus), and consequently has one end in view, which is to destroy and condemn all men eternally. That this is the nature of their endeavours I have perceived thousands and thousands of times. Unless therefore the Lord were preserving everybody in every fraction of a moment, man would perish.