This teaching explains that during the Millennial Kingdom, many people born into its perfect conditions will still reject Christ—not believing He is the Messiah and the Son of God—and that after 1,000 years, Satan will be released to deceive those unbelievers and gather them for a final rebellion. That revolt will instantly be destroyed when God sends fire from heaven, and Satan is then cast into the lake of fire to be tormented forever. This passage in Revelation 20 illustrates that human hearts remain sinful apart from new birth, so even utopian conditions cannot produce universal faith, and that God’s sovereign plan includes a final purging of unbelief before the eternal state.