Read Revelation 20:7-9.
What event marks the close of the millennium, and what opportunity does it provide Satan?
Reversal of the circumstances of Satan marks his being ‘released’. This event is linked with the resurrection of the rest of the dead who “did not live again until the thousand years were finished” (vs. 5, NKJV). The phrase “Gog and Magog” is used figuratively, as in Ezekiel 38:2, to describe those whom Satan will succeed in deceiving – the wicked from all ages. It is this universal multitude that Satan will inspire to try to overthrow the city of God. Revelation 20:9 suggests that the city, the New Jerusalem, at this time will already have descended from heaven to earth (presumably with Christ), and Satan and his hosts will march against it. A detailed description of the city is given in Revelation 21.
As said earlier, Revelation does not move in a distinctly chronological order. Look at Revelation 20:11-15. How is the idea of judgment expressed here? What is the significance of the fact that final punishment occurs after the saints are involved in judgment? Rev. 20:4.
“During the millennium the saints participate in a deliberative judgment that reviews the cases of the lost of this earth and the fallen angels. This judgment is evidently necessary in view of the cosmic nature of the sin problem. The course of the rebellion of sin has been the object of concern and interest on the part of other worlds (Job 1; 2; Eph. 3:10). The whole interlude of sin must be handled in such a way that hearts and minds throughout God’s universe are satisfied with its treatment and conclusion, with particular reference to God’s character. It is especially important for the redeemed from earth to understand God’s dealings with those who called for the rocks to fall on them and deliver them from the ‘face of him who is seated on the throne’ (Rev. 6:16). They must be totally satisfied that God was just in His decision regarding the lost.” – Handbook of Seventh-day Adventist Theology (Maryland: Review and Herald® Publishing Association, 2000), p. 932.
What does it say about the character of God that we, ourselves, can be involved in the judgment of the lost? How does this concept fit in with the whole idea of the great controversy?