For the mystery of iniquity does already work: only he who now restrains will do so, until he be taken out of the way.
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Ambrosiaster
AD 400
The mystery of iniquity began with Nero, who in his zeal for idolatry killed the apostles at the instigation of his father the Devil, and went on to Diocletian, and most recently Julian. And that, AQUINAS all the wicked who have gone before are signs of the Antichrist.
until he is taken from our midst
that is, until the wicked and the hypocrites who are in the Church which now is hidden departs from the Church. For they suppose that it is to this same mystery John alludes when in his epistle he says, “Little children, it is the last time: and as you have heard that Antichrist shall come, even now are there many antichrists; whereby we know that it is the last time. They went out from us, but they were not of us; for if they had been of us, they would no doubt have continued with us.” (1Jn 2:18-19 )
The mystery of iniquity already worketh, or is now wrought, by the precursors of antichrist; i.e. by infidels and heretics. For, as St. John says, there are many antichrists, precursors to the great antichrist, and enemies of Christ. (1 John chap. ii.) (Witham)
That he who now holdeth, do hold. That is, let each one remain in the faith which he has received of us, and let him not permit himself to be deceived by any discourse, as coming from us. Or rather, let those who shall then be in the world keep their faith, remaining firm in their belief and attachment to the Church of Christ, until antichrist, that man of iniquity, shall be taken away. (Calmet)
According to others, it is an admonition to the faithful not to be beguiled during this day of trial by such, as under the garb of religion, and with an ostentatious parade of zeal for the holy Scriptures, seek to deceive them. When the mystery of sin shall be revealed, then shall we plainly discover that apostacy from the Catholic Chu...
For the mystery of lawlessness does already work. He speaks here of Nero, as if he were the type of Antichrist. For he too wished to be thought a god. And he has well said, the mystery; that is, it works not openly, as the other, nor without shame. For if there was found a man before that time, he means, who was not much behind Antichrist in wickedness, what wonder, if there shall now be one? But he did not also wish to point him out plainly: and this not from cowardice, but instructing us not to bring upon ourselves unnecessary enmities, when there is nothing to call for it. So indeed he also says here. Only there is one that restrains now, until he be taken out of the way, that is, when the Roman empire is taken out of the way, then he shall come. And naturally. For as long as the fear of this empire lasts, no one will willingly exalt himself, but when that is dissolved, he will attack the anarchy, and endeavor to seize upon the government both of man and of God. For as the kingdoms ...
And-my mind dreads to relate it, but I will relate it, because it is about to happen-the cause of this desolation and confusion will be this; because the Roman name, by which the world is now ruled, will be taken away from the earth, and the government return to Asia; and the East will again bear rule, and the West he reduced to servitude.
The Apostle Paul also bears witness, for he says to the Thessalonians: "Let him who now restraineth restrain, until he be taken out of the way; and then shall appear that Wicked One, even he whose coining is after the working of Satan, with signs and lying wonders."
