791. 18:21 Then a mighty angel lifted up a stone like a great millstone and threw it into the sea, saying, "Thus shall Babylon, that great city, be forcefully thrown down, and not be found anymore." This symbolically means that by a powerful influx of the Lord from heaven, the Roman Catholic religion will be cast headlong into hell, together with all its adulterated truths of the Word, and angels will never see it again.

A mighty angel's lifting up symbolizes a powerful influx of the Lord from heaven; for an angel symbolizes the Lord and His operation, an operation which takes place through heaven (nos. 258, 415, 465, 649). Here, because the angel is called a mighty angel and lifts up a great millstone, the operation symbolized is a powerful one, which means a powerful influx. A stone like a great millstone symbolizes the adulterated and profaned truths of the Word; for a stone symbolizes truth, and a mill symbolizes an inquiry into, examination of, and verification of truth from the Word, as we will show in no. 794. Here, however, it symbolizes an adulteration and profanation of the Word's truth, because the subject is Babylon. Being cast into the sea means, symbolically, into hell. "Thus shall Babylon, that great city, be forcefully thrown down," symbolically means that thus that great religion will be cast headlong into hell. Its not being found anymore means, symbolically, that angels will never see it again.

[2] This is the symbolic meaning, because all adherents of the Roman Catholic religion who are caught up in its evils and falsities come, in fact, after death into the world of spirits. For that world is like a public square in which all first gather, and it is like the stomach into which all foodstuffs are first collected. The stomach also corresponds to that world. However, at this day, because the Last Judgment is over, having been completed in 1757, people are no longer allowed to stay in that world and to form for themselves pseudo-heavens, as was the case before, but as soon as they arrive there, they are sent off to societies in that world that are connected with the hells, and from time to time are cast into them. And in this way the Lord has taken care that the angels never see them again. This, then, is what is symbolically meant by that city's, that is to say, that religion's, not being found anymore.

[3] Since a millstone symbolizes the Word's truth adulterated, and the sea symbolizes hell, therefore the Lord says:

Whoever causes one of these little ones who believe in Me to stumble, it would be better for him if a great millstone were hung around his neck, and he were drowned in the depth of the sea. (Matthew 18:6; called simply a millstone in Mark 9:42, Luke 17:2)

Almost the same thing is said regarding Babylon in Jeremiah:

...when you have finished reading this book, you shall tie a stone to it and throw it into midst of the Euphrates. Then you shall say, "Thus Babylon shall sink and not rise again...." (Jeremiah 51:63-64)

The midst of the Euphrates has the same meaning as the sea, because the river Euphrates formed the boundary that separated Assyria, where Babylon was located, from the land of Canaan.