2 Thessalonians 2:6

And now ye know. — Not “now, because of what I have just said,” for nothing has yet been said in the Letter from which the Thessalonians could gather what withheld the premature manifestation of the Man of Sin. The word “now” is not used exactly in a temporal sense, but as introducing another item. “You remember about Antichrist and his characteristics: very good; and now, what keeps Antichrist back? You know that too.” Knowing not only that Antichrist’s apocalypse must precede Christ’s, but also that Antichrist could not reveal himself yet, because the way was blocked by something still (as they saw) unremoved, the Thessalonians were absurd in acting as if the day of the Lord was come.

What withholdeth. — Rather, that which withholdeth: they did not merely know it as a dogma, but as a familiar object. “You are perfectly acquainted with the thing which acts as a check upon the Man of Sin.” Unlike the Man of Sin himself, who was a dim figure in the mysterious future, the Obstacle was present and tangible. They may have forgotten what the thing is, but St. Paul stirs their memory by telling them that they well know the thing itself. It must needs be a marked and mighty power which can prevent the development of the great Antichrist. At the same time, St. Paul’s doctrine is that this marked power is destined by-and-by to be removed (2 Thessalonians 2:7). Possibly, then, St. Paul may shrink from naming it in writing, not only because he wishes to exercise the Thessalonians’ memories, but also for fear the power should discover and disapprove of his prophecies. For the question what the withholding power is, see the Excursus on the Interpretation of the Prophecy.

That he might... in his time. — Or, with a view to his being revealed at his proper moment. Not that the withholding power is conscious of such desire, but God’s design is to use that power for the purpose.