In the millennium, harmony will indeed come to the earth, but not without God’s firm control. All the ideal conditions on the earth will be brought about by God, under the rule of His perfect government—a government which He intends to display to the world, so that all will see His righteousness and justice. What a marvelous thing that will be. Instead of seeing corruption and sin and war in the news every day, and instead of seeing sin glamorized on the movies and on TV, the righteousness of God will be promoted and displayed and all will see good triumph over evil through His glorious and righteous kingdom.
The government in the millennium will be a theocracy, which is a government ruled by God. But in this theocracy God the Father delegates His rulership and authority to His Son. As Jesus declared to His disciples just before He ascended to heaven, “All authority has been given to Me in heaven and on earth.” This bestowal of authority and of the kingdom to the Son by the Father is clearly shown to us in Daniel 7:13-14:
“I kept looking in the night visions, And behold, with the clouds of heaven One like a Son of Man was coming, And He came up to the Ancient of Days And was presented before Him. 14 “And to Him was given dominion, Glory and a kingdom, That all the peoples, nations, and men of every language Might serve Him. His dominion is an everlasting dominion Which will not pass away; And His kingdom is one Which will not be destroyed.
It is clear that the resurrected and glorified Christ will reign over the earth as king in the millennium. But He will not reign alone. All those who are glorified will reign with Him—but yet under His authority ( Read Rev. 20:4-6; 1 Cor. 6:2; 2 Tim. 2:12).
As I understand it, all the glorified ones (the church, Old Testament saints, and tribulation saints) will dwell in the New Jerusalem—the city that God has prepared for them (Jn. 14:2; Gal. 4:26; Heb. 11:10-16; 12:22-24; Rev. 3:12; 21:2, 10). And this will be the primary dwelling of Christ too. For in John 14:3 it says of this place, “…that where I am, there you may be also.”
We don’t know what all we will do in the New Jerusalem. Certainly we will enjoy the presence of Christ. But since He and all the glorified ones will reign over the earth, it seems to me that this New Jerusalem will also function as the headquarters of rulership, where we will discuss matters of government and make government decisions.
Though the New Jerusalem will be the dwelling place of the glorified, I think they (we) will also be free to come to the earth and interact with mortals—to make sure that laws and policies are being carried out as prescribed by the King. There may be some glorified ones who even have positions of leadership on the earth, such as David. It is possible that he will be the prince who reigns over Israel and Jerusalem (Ezekiel 34:23-24) and that the twelve disciples will reign under him as lesser princes judging the twelve tribes of Israel (Matt. 19:28). If this is true I don’t think they will live on the earth. I think they will live in the New Jerusalem with the rest of the glorified and will miraculously commute to the earth whenever needed to fulfill their governing duties.