2:5-12 Something hindered or withheld the man of sin. It is supposed to be the power of the Roman empire, which the apostle did not mention more plainly at that time. Corruption of doctrine and worship came in by degrees, and the usurping of power was gradual; thus the mystery of iniquity prevailed. Superstition and idolatry were advanced by pretended devotion, and bigotry and persecution were promoted by pretended zeal for God and his glory. This mystery of iniquity was even then begun; while the apostles were yet living, persons pretended zeal for Christ, but really opposed him. The fall or ruin of the antichristian state is declared. The pure word of God, with the Spirit of God, will discover this mystery of iniquity, and in due time it shall be destroyed by the brightness of Christ's coming. Signs and wonders, visions and miracles, are pretended; but they are false signs to support false doctrines; and lying wonders, or only pretended miracles, to cheat the people; and the diabolical deceits with which the antichristian state has been supported, are notorious. The persons are described, who are his willing subjects. Their sin is this; They did not love the truth, and therefore did not believe it; and they were pleased with false notions. God leaves them to themselves, then sin will follow of course, and spiritual judgments here, and eternal punishments hereafter. These prophecies have, in a great measure, come to pass, and confirm the truth of the Scriptures. This passage exactly agrees with the system of popery, as it prevails in the Romish church, and under the Romish popes. But though the son of perdition has been revealed, though he has opposed and exalted himself above all that is called God, or that is worshipped; and has spoken and acted as if he were a god upon earth, and has proclaimed his insolent pride, and supported his delusions, by lying miracles and all kinds of frauds; still the Lord has not yet fully destroyed him with the brightness of his coming; that and other prophecies remain to be fulfilled before the end shall come.

6. now ye know—by my having told you. The power must have been one "known" to the Thessalonians.

what withholdeth—that which holds him back; "keeps him in check": the power that has restrained the man of sin from his full and final development, is the moral and conservative influence of political states [Olshausen]: the fabric of human polity as a coercive power; as "he who now letteth" refers to those who rule that polity by which the great upbursting of godlessness is kept down [Alford]. The "what withholdeth" refers to the general hindrance; "he who now letteth," to the person in whom that hindrance is summed up. Romanism, as a forerunner of Antichrist, was thus kept in check by the Romanemperor (the then representative of the coercive power) until Constantine, having removed the seat of empire to Constantinople, the Roman bishop by degrees first raised himself to precedency, then to primacy, and then to sole empire above the secular power. The historical fact from which Paul starts in his prediction was probably the emperor Claudius' expulsion of the Jews, the representative of the anti-Christian adversary in Paul's day, from Rome, thus "withholding" them in some degree in their attacks on Christianity; this suggested the principle holding good to the end of time, and about to find its final fulfilment in the removal of the withholding person or authority, whereupon Antichrist in his worst shape shall start up.

that he might be—Greek, "in order that": ye know that which keeps him back, in God's purposes, from being sooner manifested, "in order that he may be revealed in his own time" (that is, the time appointed by God to him as his proper time for being manifested), not sooner (compare Da 11:35). The removal of the withholding power will be when the civil polity, derived from the Roman empire, which is to be, in its last form, divided into ten kingdoms (Re 17:3, 11-13), shall, with its leading representative head for the time being ("he who now letteth," Greek, "withholdeth," as in 2Th 2:6), yield to the prevalent godless "lawlessness" with "the lawless one" as its embodiment. The elect Church and the Spirit cannot well be, as De Burgh suggests, the withholding power meant; for both shall never be wholly "taken out of the way" (Mt 28:20). However, the testimony of the elect Church, and the Spirit in her, are the great hindrance to the rise of the apostasy; and it is possible that, though the Lord shall have a faithful few even then, yet the full energy of the Spirit in the visible Church, counteracting the energy or "working" of "the mystery of lawlessness" by the testimony of the elect, shall have been so far "taken out of the way," or set aside, as to admit the manifestation of "the lawless one"; and so De Burgh's'S view may be right (Lu 18:8; Re 11:3-12). This was a power of which the Thessalonians might easily "know" through Paul's instruction.