The Lord has established his throne in the heavens, and his kingdom rules over all. Psalms 103:19 NRSV
In the days before superheroes filled children's minds, there were stories of kings, queens, and knights. The most famous of these was the fictional King Arthur and the Knights of the round table. There are also accounts of kings in the Bible, a few good ones (read 2 Chronicles), but most acted in their self-interest, motivated by power and greed.
Some Christians, offended by the wickedness and abuse commonly associated with earthly kingdoms, choose to use kin-dom. While I still use the traditional word, I appreciate their point. The kingdom of God is not remotely close to the earthly one; its composition is not of the tangible but of the intangible. The things of value in God's kingdom are not the outward trappings of wealth and power but the inward acts of compassion, justice, mercy, and love.
While God's throne is in heaven, his dominion is over all creation. He created us in his image and placed us on earth to be co-rulers. As such, we are to demonstrate the values of his kingdom. Our job is not to wait for Christ's return but to make His kingdom a reality now.
Father of us all, lead and guide us by the Holy Spirit into your kingdom. Grant us the courage to bring about your heavenly kingdom here on earth. We pray this in the name of our Lord and Savior, Jesus Christ. Amen.