2 Thessalonians 2:6

“And now ye know what withholdeth, &c.] 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…”

“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…”

“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…”

“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. 2 Thessalonians 2:7”

“2:6 what is holding him back: This has been variously identified as God, the Holy Spirit, the church, the gospel, Paul, the emperor, the Roman Empire, or the government. Alternatively, the term may refer to something or someone who comes before the man of lawlessness, an agent of the lawlessness active at that time (2:7-8); in Greek literature, this expression could describe demonic possession. This figure would prepare the way for the man of lawlessness when his time comes (2:3, 8).”

“withholdeth: or, holdeth, Th2 2:7 revealed: Th2 2:3, Th2 2:8 2 Thessalonians 2:7”