And the heavens departed as a scroll when it is rolled together; and every mountain and island were moved out of their places.
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Bede
AD 735
mountain: He speaks of the members of the Church, as differing according to the character of their offices or powers, and foretells, that no one will be without his share in this whirlwind. But the movement caused by it will be dissimilar, for in the good it will be one of precaution by flight, but in the bad, of giving way by compliance. <a
heaven: As a scroll rolled up contains indeed mysteries within, so will it be with the Church. At that time, known only to her own, she will prudently avoid persecution in retirement, that by such concealment she may remain unperceived by those without.
And every mountain. In the dreadful confusion of the Roman empire, in the time of Constantine, so great was the revolution, that mountains appeared, as it were, moved out of their places; islands shifted from their accustomed situations. We behold at one time seven persons, Maxim in Galerius, Maxentius, Severus Cæsar, Maxim in, Alexander, Maxim in Hercules, and Licinius, all aiming at the empire. The first six perished in nine years, from 305 to 314: Licinius was strangled in 324. All these were enemies of the Christian religion. Constantine, who supported it, remained sole master of the empire. (Calmet)
Mountains and islands removed from their places intimate that in the last persecution all men departed from their places; that is, that the good will be removed, seeking to avoid the persecution.