Revelation 11:15 And the seventh angel sounded; and there were great voices in heaven, saying, The kingdoms of this world are become the kingdoms of our Lord, and of his Christ; and he shall reign forever and ever.
When the Last Day comes this world and everything in it, every nation, kingdom, authority, power, and rule will be gone. Everything of this world will be transformed, purged, and absorbed into the eternal Kingdom of God. The Kingdom will be the only thing left. That promise is good news for those who ”seek first the kingdom of God,” since that is the only thing left remaining. Over that kingdom Jesus Christ reigns forever. And that’s a good thing.
This promise encourages us not to seek after the things of this world, for nothing this world offers (money, power, pleasure) lasts or satisfies. Finally, ”God will be all in all [1 Corinthians 15:28].” The wise thing to do, then, is get into the kingdom of God now by baptism and faith in the gospel. And then the believer continues to ”set his mind on the things above” by hearing and receiving the Gospel weekly and daily. Believe the Good News and live in the eternal kingdom today and forever. Jesus comes. Heaven comes down. Eternity is in the heart. Life rules forever.