What does Revelation 18:21 mean?
What is the meaning of Revelation 18:21?

Then a mighty angel

Revelation repeatedly shows God commissioning powerful angelic beings to carry out His judgments (Revelation 5:2; 10:1; 14:15). Their strength and authority flow from the Lord of hosts. By introducing “a mighty angel,” the verse signals that what follows is neither ordinary nor symbolic only—it is a real, divinely directed act that no earthly force can resist.


Picked up a stone the size of a great millstone

A millstone was a massive stone used for grinding grain; Jesus spoke of it as an object so heavy that it would drag a person to the depths if tied around the neck (Matthew 18:6). Jeremiah enacted Babylon’s doom by tying a stone to a scroll and sinking it in the Euphrates (Jeremiah 51:63-64). The angel’s choice of a millstone underscores:

• immensity—Babylon’s power looks impressive, but the angel lifts the stone with ease.

• inevitability—the weight guarantees that, once dropped, it will never resurface.


Cast it into the sea

The sea swallows the stone just as God once hurled Pharaoh’s armies into the Red Sea (Exodus 15:1, 21). Micah celebrated that God “will cast all their sins into the depths of the sea” (Micah 7:19). Here the action pictures irreversible judgment: Babylon’s fall is not partial or temporary; it sinks beyond recovery.


Saying: “With such violence the great city of Babylon will be cast down”

The angel interprets the sign: the city falls suddenly, forcefully, and completely. Earlier prophecies announced, “Fallen, fallen is Babylon the Great” (Revelation 14:8; 18:2). God’s wrath accumulated until the appointed moment (Revelation 16:19). The violence is righteous, answering the prayers of saints for justice (Revelation 6:10).


Never to be seen again

The closing words echo Old Testament pronouncements over doomed cities—“You will never be rebuilt” (Jeremiah 51:26) and “You will never be found again” (Ezekiel 26:21). Immediately after verse 21, John lists silence where music, crafts, and weddings once flourished (Revelation 18:22-23). The destruction is final: no revival, no reprieve, no second chance.


summary

Revelation 18:21 uses a dramatic, literal act—an angel hurling a millstone into the sea—to picture Babylon’s sudden, violent, and irreversible downfall. The scene assures believers that God’s justice will prevail, that evil powers will be permanently removed, and that the Lord alone remains unshakable and supreme.

Why are heaven, saints, and apostles called to rejoice in Revelation 18:20?
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