Now think about this. In Roman times it was no different. After the civil wars of the mid-to-late first century they didn't want all those retired soldiers hanging around Rome so they sent them off with a mission to colonize the world. The city of Philippi was one such colony. The former soldiers, whose citizenship was in Rome, were to bring Roman culture to the new city-values, government, education, transportation, military, etc. And what would happen if there was an uprising. Rome would send soldier to rescue them and in the extreme the Caesar would come himself. Caesar was also given the titles of Savior, Son of God, and King.
Now read this:
But our citizenship is in heaven and from it we await a Savior, the Lord Jesus Christ.
- Letter to the Christians in Philippi aka. Philippians 3:20
That's not to say that if we work extremely hard then we can bring about God's Kingdom here on earth-the 20th Century should have put a nail in the coffin of that pipe dream. But that is to say that our heavenly citizenship is actually a calling to work in the here and now. So that when in a dramatic moment God's new Heaven and new Earth (that is to say, New Creation) are revealed, while it will be dramatically different, there will also be a strange, fitting, just, continuity with the kingdom building work that God's people have done in the present.
Therefore, my beloved brothers, be steadfast, immovable, always abounding in the work of the Lord, knowing that in the Lord your labor is not in vain.