Jamieson, Fausset and Brown on Revelation 13:12

12. power--Greek, "authority."

before him--"in his presence"; as ministering to, and upholding him. "The non-existence of the beast embraces the whole Germanic Christian period. The healing of the wound and return of the beast is represented [in regard to its final Antichristian manifestation though including also, meanwhile, its healing and return under Popery, which is baptized heathenism] in that principle which, since 1789, has manifested itself in beast-like outbreaks" [Auberlen].

which dwell therein--the earthly-minded. The Church becomes the harlot: the world's political power, the Antichristian beast; the world's wisdom and civilization, the false prophet. Christ's three offices are thus perverted: the first beast is the false kingship; the harlot, the false priesthood; the second beast, the false prophet. The beast is the bodily, the false prophet the intellectual, the harlot the spiritual power of Antichristianity [Auberlen]. The Old-Testament Church stood under the power of the beast, the heathen world power: the Middle-Ages Church under that of the harlot: in modern times the false prophet predominates. But in the last days all these God-opposed powers which have succeeded each other shall co-operate, and raise each other to the most terrible and intense power of their nature: the false prophet causes men to worship the beast, and the beast carries the harlot. These three forms of apostasy are reducible to two: the apostate Church and the apostate world, pseudo-Christianity and Antichristianity, the harlot and the beast; for the false prophet is also a beast; and the two beasts, as different manifestations of the same beast-like principle, stand in contradistinction to the harlot, and are finally judged together, whereas separate judgment falls on the harlot [Auberlen].

deadly wound--Greek, "wound of death."