Amillennialism is the view held by many in the Reformed tradition that the 'thousand years' mentioned in Revelation 20 symbolizes the current church age. It teaches that Christ is currently reigning from heaven and that his kingdom exists spiritually in the hearts of believers and through the church, rather than as a future, earthly political reign.
Amillennialism interprets the 'thousand years' in Revelation 20:4-6 not as a literal, future chronological period, but as a symbolic representation of the entire era between Christ's first and second comings. During this time, Christ is enthroned and reigning, and the gospel continues to advance, gathering the elect into his kingdom. As noted in the Heidelberg Catechism Q.123, believers pray for this kingdom to fully manifest, recognizing that Christ's rule is already established and expanding through his Word and Spirit until he comes again.
The Reformed tradition, whether amillennial or otherwise, maintains a firm focus on the literal, bodily return of Jesus Christ to judge the living and the dead. As stated in the Belgic Confession Art. 37, we look forward to the day when the number of the elect is complete and Christ returns in glory. This aligns with the Westminster Confession of Faith Ch. 33 §3, which emphasizes that the uncertainty of the timing of this final judgment is intended to keep the church watchful and prayerful. Our hope rests not in political utopias, but in the final restoration of all things in Christ.