Horatius Bonar emphasizes the dual role of the redeemed as both servants and kings, based on Revelation 22:3, 5. He explains that service to God begins at conversion and is a lifelong commitment, while the future reign signifies the ultimate victory and dominion believers will have in eternity. Bonar encourages believers to embrace their identity as servants of Christ, highlighting that true freedom and joy come from serving Him. He contrasts the current state of the Church with the glorious future awaiting the faithful, urging them to remain steadfast in their faith and service. The sermon concludes with a call to live in anticipation of the eternal reign that awaits those who overcome.