New Defender's Study Bible Notes
20:7 Satan shall be loosed. The events described in Revelation 20:7-9 take place only after there have been a thousand years of enforced peace and righteousness. In Revelation 20:3, it was said that Satan must be loosed a little season, evidently to give men an opportunity to reveal the basic rebellion still simmering in their human natures, and in order to see openly whether they will choose Satan over God, as their ancestors had done a thousand years before. Those entering the millennial period, of course, will be genuine believers, but their descendants will evidently drift away from the faith of their fathers as the generations accumulate and the population grows. Open rebellion, as well as crime and warfare, will be impossible. Satan and his hosts will all be bound in Hades, but men and women will still be born with sinful natures and will need to receive Christ as personal Savior by faith, just as was always true. If they do not, they will still be vulnerable to Satanic deception when Satan is released to tempt them.