What does it mean that Christ must reign until all enemies are defeated?

The phrase 'Christ must reign' emphasizes the sovereignty of Jesus as He exercises His authority over heaven and earth. This reign is not indefinite; as indicated in 1 Corinthians 15:25, Christ must reign until He has put all enemies under His feet, including the final enemy, death. This scriptural truth assures believers of Christ's ultimate victory and the establishment of God's kingdom on earth. It also teaches that the current age is under His providence, as He guides history towards the fulfillment of His redemptive plan. Understanding His reign helps Christians to live in hope, knowing that every power opposed to God will ultimately be vanquished, and that they are part of His eternal kingdom.