And now what withholdeth To katechon means here properly an impediment or occasion of delay. Chrysostom, who thinks that this can only be understood as referring to the Spirit, or to the Roman Empire, prefers to lean to the latter opinion. He assigns a plausible reason -- because Paul would not have spoken of the Spirit in enigmatical terms, [1] but in speaking of the Roman Empire wished to avoid exciting unpleasant feeling. He states also the reason why the state of the Roman Empire retards the revelation of Antichrist -- that, as the monarchy of Babylon was overthrown by the Persians and Medes, and the Macedonians, having conquered the Persians, again took possession of the monarchy, and the Macedonians were at last subdued by the Romans, so Antichrist seized hold for himself of the vacant supremacy of the Roman Empire. There is not one of these things that was not afterwards confirmed by actual occurrence. Chrysostom, therefore, speaks truly in so far as concerns history. I am of opinion, however, that Paul's intention was different from this -- that the doctrine of the gospel would require to be spread hither and thither, until nearly the whole world were convicted of obstinacy and deliberate malice. For there can be no doubt that the Thessalonians had heard from Paul's mouth as to this impediment, of whatever sort it was, for he recalls to their remembrance what he had previously taught in their presence. Let my readers now consider which of the two is the more probable -- either that Paul declared that the light of the gospel must be diffused through all parts of the earth before God would thus give loose reins to Satan, or that the power of the Roman Empire stood in the way of the rise of Antichrist, inasmuch as he could only break through into a vacant possession. I seem at least to hear Paul discoursing as to the universal call of the Gentiles -- that the grace of God must be offered to all -- that Christ must enlighten the whole world by his gospel, in order that the impiety of men might be the more fully attested and demonstrated. This, therefore, was the delay, until the career of the gospel should be completed, because a gracious invitation to salvation was first in order. [2] Hence he adds, in his time, because vengeance was ripe after grace had been rejected. [3]

Footnotes

1 - "En termes couuerts ou obscurs;" -- "In hidden or obscure terms."

2 - "D'autant que l'ordre que Dieu vouloit tenir, requeroit que le monde premierement fust d'vne liberalite gratuite conuié a salut;" -- "Inasmuch as the order that God designed to maintain, required that the world should first of all be invited to salvation by a gracious liberality."

3 - "La droite saison de la vengeance estoit apres la grace reiette;" -- "The right season of vengeance was after grace had been rejected."

And now ye know what withholdeth - Margin, "holdeth." The reference is, to something that then operated to constrain or hold back the obvious tendency of things, so that the "man of sin" should not at once appear, or so that things should not soon so develop themselves as to give rise to this anti-Christian power. There were causes at work even then, which would ultimately lead to this; but there was also something which checked the tendency of things, so that the revelation or development of the "man of sin" was put off to a future period. The obvious meaning of this would be, that, when the apostle wrote, there was a tendency to what would occur under the great apostasy, and that this would soon develop itself if it were not restrained. If the reference is to the papacy, this would consist in corruptions already existing in the church, having a resemblance to those which afterward existed under that system, or which were the germ of that system.
If there was a tendency toward the concentration of all power in an individual in the church, - if there was an assumption of authority by one class of ministers above another, - if there was a denial of the "parity of the clergy," the tendency would have been to that ultimate assumption of authority which is found in the Romish hierarchy. But conjecture is useless as to what was the precise form in which this tendency then began to develop itself. That the corruptions early began in the church which terminated in the papacy, and which led on directly to it, we know; and that the apostle was able to foresee and predict such a final development, shows that he was under the influence of inspiration. It is not known precisely what is referred to by the phrase "what withholdeth," τὸ κατέχον to katechon. The phrase means properly, something that "holds back," or "restrains."
The word here is in the neuter gender, "What withholdeth." In the following verse it is in the masculine gender, ὁ κατέχων ho katechōn - "he that letteth," or withholdeth; and the reference would seem to be to some agency or state of things under the control of an individual, or of some civil power, that then operated as a restraint on the natural tendency of things. Of this, the apostle says, they had had full information; but we can only conjecture what it was. The restraining power of anything controlled by an individual, or of any government, or the restraining power of God, would meet all that the phrase implies. The most natural interpretation is that which refers it to civil power, meaning that there was something in the form of the existing administration which would prevent this development until that restraint should be removed. The supposition that there was even then a tendency to concentrate all ecclesiastical power at Rome, and that while the civil authority remained there it would not suffer ecclesiastical power to grow to the exorbitant height which it ultimately reached, will meet all that is implied in the language.
That he might be revealed in his time - The man of sin. The meaning is, that there was then a restraint operating which would prevent the development of this anti-Christian power until the proper time; that is, until the state of the world should be such that in the divine arrangements it would be proper to permit it. It was not to be permitted until the gospel should be extensively preached, and had had an opportunity of showing its fair effects on the nations; until it had become so planted and established that even the rise of this anti-Christian power could not effectually uproot it. If the "man of sin" had been permitted to rise at once, the consequence might have been that the new religion would have been crushed, so that it could never have revived again. There was then a providential arrangement by which this growth of wickedness should be checked and restrained, until the new religion should take deep root in the earth, and its perpetuity should be secured. Then the great trial was to be permitted under the "man of sin."

And now ye know what withholdeth - I told you this among other things; I informed you what it was that prevented this man of sin, this son of perdition, from revealing himself fully.

And now ye know (g) what withholdeth that he might be revealed in his time.
(g) What hinders and stops.

And now ye know what withholdeth,.... Or hinders the revelation of the man of sin, or antichrist; by which is meant not the Apostle Paul, though he by his ministry was a very great hinderance of the growth of error, and the spread of evil practices in the churches, and so of the more open appearance of the man of sin in his forerunners; and after his departure from Ephesus, and imprisonment at Rome, and suffering death, there was a great falling off in the churches, and among professors of religion, which made way for the manifestation of antichrist in due time: nor the preaching of the Gospel, in its power and purity, in the several parts of the world; though so long as this obtained, got ground, and gained success, the man of sin could not show his head; and therefore it must, as it did, decline, and was gradually taken away that he might appear: nor the Spirit of God, as the spirit of truth and holiness, though as long as he continued in his gifts and operations of grace in the churches, they were preserved from antichristian doctrine and worship; but when he removed from them, this enemy and adversary of Christ and his Gospel came in like a flood: nor the general defection in 2-Thessalonians 2:3 though that was to be previous to the revelation of antichrist, and was to be what would usher him in; nor could he appear until the wickedness of men was come to a pitch, that they would be ready to receive him, and pay homage and worship to him: nor is the decree of God meant, though till the time came fixed by God for his appearance, the decree must be a bar in his way; since as there is a time for every purpose, nothing can come to pass till that time comes: but by that which withheld, let or hindered the open appearance of antichrist, were the Roman empire and emperors; these stood in his way, and while this empire lasted, and the emperors wore the imperial crown, and sat on the throne, and held the government in their hands, the popes could not come at the height of their ambition, dignity, and authority, nor shine in their glory; nor could the whore of Babylon take her seat, and sit upon the seven hills of Rome until the Roman emperor was taken out of the way: this therefore hindered,
that he might be revealed in his time. The Ethiopic version renders it, "until his time appointed came": wherefore till the time that God had fixed for the appearance of this monster of iniquity, this son of perdition, the Roman empire must continue, and Roman emperors must keep their place and dignity to prevent his appearance sooner: the reason why the apostle expresses this not in plain words, but in an obscure manner, and with so much caution, was, that he might not offend the Roman emperors, and provoke them to a severe persecution of them as seditious persons, that sought the destruction of the empire: the word here used, which is rendered "withholdeth", or "letteth", as in the next verse, signifies a ruler or governor, and answers to the Hebrew word "to keep back, or restrain"; and which is used of kings, who by their laws and government restrain and withhold people from doing what they would; see 1-Samuel 9:17 to which the apostle, who well understood the Hebrew language, doubtless had reference; so , is rendered, "a magistrate", in Judges 18:7.

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 Daniel 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 (Revelation 17:3, Revelation 17:11-13), shall, with its leading representative head for the time being ("he who now letteth," Greek, "withholdeth," as in 2-Thessalonians 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" (Matthew 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 (Luke 18:8; Revelation 11:3-12). This was a power of which the Thessalonians might easily "know" through Paul's instruction.

Ye know now what withholdeth. They knew because Paul had told them when with them. We have not that advantage, but I believe that he told them that this development could not take place until pagan imperial Rome fell. We know that it did withhold, or prevent it.
For the mystery of iniquity. This revelation of the man of sin. It was a mystery, that is, something yet hidden.
Doth already work. Causes are beginning to work which will lead to it.
Only he who now letteth. He that hindereth must first be taken out of the way. There was no room for an arrogant spiritual power in Rome as long as imperial Rome continued to persecute the church. A persecuted church cannot be a haughty church. Two things were needful before the papal power could be developed; viz., the overthrow of paganism, and the removal of the capital of the Empire from Rome. When these things were done, it was free to seize the old Roman scepter.
Then shall that Wicked be revealed. After the hindering power is removed.
Whom the Lord shall consume. The Wicked power will be destroyed by the Lord's coming, and will continue to exist, possibly, until that event.
Whose coming. That of the Wicked power.
Is after the working of Satan. That is, it will deceive men as Satan does.
Lying wonders. False miracles.
Deceivableness of unrighteousness. Unrighteous delusions which will be accepted by its votaries, them that perish. Those that perish, receive not the love of the truth. They have a disinclination to receive it.

And now ye know - By what I told you when I was with you. That which restraineth - The power of the Roman emperors. When this is taken away, the wicked one will be revealed. In his time - His appointed season, and not before.