Babylon the great is fallen, is fallen. Idolatrous Rome is fallen. That mighty seat of power and dominion is fallen. The long fixed abode of voluptuousness and luxury, for the merchants of the earth have become rich by the strength of her delicacies, and now the hand of God hath struck her. It is utterly destroyed; not a human being in it. Thus it is become an accursed place, given up for an habitation of devils and a hold of every unclean spirit, or of frightful spectres and ghosts, and a hold of every unclean and hateful bird, of owls, ravens, vultures, &c. &c. (Pastorini)
Go out from her, my people. The people of God, the Christians, are all here told to leave the falling city, lest they be partakers of her sins, and receive of her plagues. At the time of Alaric's sacking Rome, many fled away to St. Jerome, who was then in Judea; others fled into other parts, as many holy fathers testify. St. Jerome says, (Ep. vii) that St. Paula and several illustrious Christian families had left Rome as if by particular inspiration, and retired into Judea. The holy pope Innocent was drawn by a particular providence out of the city, as Lot out of Sodom, that he might not see the ruin of a guilty people, says Orosius, lib. 7. chap. xxxix. We read likewise that Melania, as if she foresaw the approaching catastrophe, had prevailed upon many Christians to retire with her from a city doomed to destruction. (Histor. Laus. chap. cxviii.) In fine, we all know that when the storm broke out, the Christians took refuge and were saved in the Churches of St. Peter and St. Paul, which Alaric had allowed to be places of safety. (Haydock)
Alas! alas! St. Augustine informs us, that the people of the eastern provinces, and the remotest cities, mourned in a public manner on this occasion. (De Civ. Dei. lib. 1, chap. xxxiii.)
We see here enumerated the articles of the luxury of the pagan Romans in dress, in ornaments, in furniture, in equipage, in the sumptuousness of their tables, &c. &c. Nothing is more remarkable than the extravagant luxury and profusion of some of the Roman emperors at their tables. Caligula once spent (according to Seneca) for a supper, 150,000 crowns. Suetonius tells us, that the emperor Vitellius would feast himself thrice, and often four times in a day, spending 10,000 crowns at each meal. But now they are all gone; they are now the fuel of fire, and in one hour brought to nought. (Haydock)
Rejoice....heaven, the holy apostles and prophets, and all the holy ministers of the gospel: and holy men are invited here to rejoice, because the divine justice is accomplished in the ruin of that guilty city. (Pastorini)
By the words prophets, &c. are not meant those of the old law, as pagan Rome had not been the cause of their deaths, but here only includes all the prophets, saints, and martyrs, who had been put to death for Christ throughout the whole Roman empire. (Haydock)
Apocalypse 18Haydock Commentary