What does it mean that Christ must reign until all enemies are under His feet?

In 1 Corinthians 15:25, the phrase 'He must reign till He hath put all enemies under His feet' indicates that Christ's rule is both current and progressive. It signifies that He exercises authority to bring all rebellion and opposition to His rightful place of submission. This will ultimately culminate in a time when all who oppose God will acknowledge His lordship, thus fulfilling the Father's plan and securing victory over every spiritual force that stands against Him. It reassures believers of the ultimate triumph of Christ over evil and the certainty of God's justice being established.