"The kingdom of the world has become the kingdom of our Lord and of his Messiah, and he will reign for ever and ever." (Revelation 11:15)
John is given a reed to measure the temple of God and the altar and those who worship there, but not the outer court, which is given to the nations who will trample the holy city for forty-two months. God will appoint two witnesses who will prophesy for 1,260 days, clothed in sackcloth. They are the two olive trees and the two lampstands that stand before the Lord of the earth. They have power to shut up the sky so that it will not rain, to turn the waters into blood, and to strike the earth with every kind of plague. When they have finished their testimony, the beast from the Abyss will attack and kill them, leaving their bodies in the great city where the Lord was crucified. The world celebrates. After three and a half days the breath of life enters them and they stand on their feet, and they ascend to heaven in a cloud while their enemies look on.
The two witnesses represent the prophetic witness of the Church through history: always under threat, at times apparently defeated, but ultimately vindicated. The three and a half days of their death echoes the three days of Christ's burial and the resurrection that followed. The Catechism sees in the two witnesses the Church's unceasing prophetic mission, which the world will always resist and which God will always vindicate (CCC 674).
When the seventh trumpet sounds, loud voices in heaven cry out: The kingdom of the world has become the kingdom of our Lord and of his Messiah, and he will reign for ever and ever. The twenty-four elders fall on their faces and worship, giving thanks because the Lord God Almighty has taken his great power and begun to reign. The temple in heaven is opened and the ark of the covenant is seen. Thunder, lightning, earthquake, and great hail.
Brothers and sisters, the kingdom of the world has become the kingdom of our Lord. This is not a future political prediction. It is the declaration of what the Cross accomplished: the decisive transfer of authority from the powers of this age to the crucified and risen Messiah. Every act of Christian witness, every sacrament administered, every act of mercy performed is done in this kingdom, under this reign. He will reign forever and ever. Act accordingly.
Lord God Almighty, you have taken your great power and begun to reign. The kingdom of the world has become the kingdom of your Messiah. Let us live as citizens of that kingdom, witnesses to your reign in the midst of the powers that have not yet acknowledged it. Through Christ our Lord. Amen.