2 Kings 19:15O Lord, you are God, you alone, of all the kingdoms of the earth; you have made heaven and earth.
The kingdom of the world has become the kingdom of our Lord and of his Messiah, and he will reign forever and ever.
One classic definition of the Kingdom of God is, “The gracious reign of Christ in the heart of the believer.” This is a great definition for at least two reasons. First of all, the word “reign” is a better word than “kingdom” insofar as it helps us understand, perhaps, that this is not referring to a political territory, but a realm of influence. Secondly, it emphasizes both the grace of God as well as the place of faith in the reign of God. His is a gracious reign, and it is by faith, and in our hearts.
There is another facet of this that is also worth noting: Martin Luther speaks of this in his explanation to the Second Article of the Apostle’s Creed: “…that I may be [Jesus Christ’s] own and live under him in his kingdom, and serve him…” The purpose of Christ’s redemption is not just so we go to heaven, it is so that we experience his gracious reign in our hearts now as well.
The question, “Who reigns in your heart?” is important, for one day every knee will bow and every tongue will confess that Jesus Christ is Lord. We who believe in Jesus, and who call him Lord will rejoice on that day. Until then, we can also rejoice in Christ’s reign of grace in our hearts. He is a deeply and profoundly good king!