And the heaven departed as a scroll - The whole system of pagan and idolatrous worship, with all its spiritual, secular, and superstitious influence, was blasted, shrivelled up, and rendered null and void, as a parchment scroll when exposed to the action of a strong fire.
And every mountain - All the props, supports, and dependencies of the empire, whether regal allies, tributary kings, dependent colonies, or mercenary troops, were all moved out of their places, so as to stand no longer in the same relation to that empire, and its worship, support, and maintenance, as they formerly did.
And island - The heathen temples, with their precincts and enclosures, cut off from the common people, and into which none could come but the privileged, may be here represented by islands, for the same reasons.

And the heaven departed as a scroll when it is rolled together,.... The manner of writing formerly was on rolls of parchment; hence the word volume is used for a book, which, when rolled up, the writing within could not be seen, not a syllable nor letter of it. In like manner the Roman empire, as Pagan, which was like a large sheet, or rather like the expanse or firmament of the heaven, stretched out over all the earth, was now, as to the Paganism of it, rolled up together, so that there were no more Heathen gods, nor Heathen priests; no more idolatry, and idolatrous worship of that kind were to be seen, and not so much as the names of Heathen gods to be heard of in the empire.
And every mountain and island were moved out of their places; by "every mountain" may be meant the places of idolatrous worship, which were usually upon mountains; see Jeremiah 3:6; which were now shut up, or demolished, or used for Christian worship; and "every island" being moved also may show, that Paganism was not only rooted out of the provinces of the empire upon the continent, but out of the islands also; and the ecclesiastical history of these times informs us, that there were Christian churches in the isles, which enjoyed the Gospel free of persecution and distress; as in the isles of Cyprus, Crete, the Cyclades, Sardinia, Siciiy, Corsica, and in ours of England, Scotland, and Ireland (o). Mr. Daubuz thinks, that as "mountains" design the temples of idols, "islands" signify the revenues of them, which were now taken away, and applied to other uses.
(o) Centuriator. Magdeburg. Cent. 4. c. 2. p. 5, 8.

departed--Greek, "was separated from" its place; "was made to depart." Not as ALFORD, "parted asunder"; for, on the contrary, it was rolled together as a scroll which had been open is rolled up and laid aside. There is no "asunder one from another" here in the Greek, as in Acts 15:39, which ALFORD copies.
mountain . . . moved out of . . . places-- (Psalm 121:1, Margin; Jeremiah 3:23; Jeremiah 4:24; Nahum 1:5). This total disruption shall be the precursor of the new earth, just as the pre-Adamic convulsions prepared it for its present occupants.

And the heavens departed as a book that is rolled together - When the scripture compares some very great with a little thing, the majesty and omnipotence of God, before whom great things are little, is highly exalted. Every mountain and island - What a mountain is to the land, that an island is to the sea.