And this kingship of Christ will last until the victory over the enemies is complete and even death has been abolished, I Cor. At the consummation of all things the God-man will give up the authority conferred on Him for a special purpose, since it will no more be needed. He will return His commission to God, that God may be all in all. Christ's kingship thus is the restoration of Adam's original kingship, and of the kingship under God which we lost in Adam. Man in his sin rejected kingship, because God's requirement for kingship means rule over ourselves and over all creation in terms of God's law word.
Kingship means responsibility and work.
The association of royal status with battle, work, and responsibility is very clear in I Cor. For he must reign, till he hath put all enemies under his feet. The last enemy that shall be destroyed is death. For he hath put all things under his feet. But when he saith, all things are put under him, it is manifested that he is exempted, which did put all things under him.