Matthew Poole and continuators on Revelation 13:12

12 And he exerciseth all the power of the first beast before him , and causeth the earth, and all that dwell, therein, to worship the first beast, whose deadly wound was healed .

The power of the first Beast was to speak great Words and Blasphemies, and to make War with, and overcome the Saints, v. 6, 7. This power also should be exercised by the Papacy (according to this Prophecy) and time hath witnessed the truth of it.

And as before he arrived at the heighth of Power, he had perswaded the latter Emperours to establish Idolatry and Superstition; so having now the power in his own hands, and being by the first Beast made Head of the Church, he now vigorously causeth all under his power to obey the Edicts, Decrees and Commands of that Nature, which those Emperors had published; chusing rather to do this in the Name of others, than from himself; that in case of the non-compliance of any, he might charge them with Sedition or Disobedience to the Imperial Laws, or dissenting from Antiquity &c. Hence he causeth them to worship the first Beast rather than himself.

Marginal references: Ver. 3.