2 Thessalonians 2:8

8And then will be revealed — that is, when that impediment ( τὸ κατέχον) shall be removed; for he does not point out the time of revelation as being when he, who now holds the supremacy, will be taken out of the way, but he has an eye to what he had said before. For he had said that there was some hindrance in the way of Antichrist’s entering upon an open possession of the kingdom. He afterwards added, that he was already hatching a secret work of impiety. In the third place, he has interspersed consolation, on the ground that this tyranny would come to an end. (661) He now again repeats, that he (662) who was as yet hidden, would be revealed in his time; and the repetition is with this view — that believers, being furnished with spiritual armor, may, nevertheless, fight vigorously under Christ, (663) and not allow themselves to be overwhelmed, although the deluge of impiety should thus overspread. (664)

Whom the Lord. He had foretold the destruction of Antichrist’s reign; he now points out the manner of his destruction — that he will be reduced to nothing by the word of the Lord. It is uncertain, however, whether he speaks of the last appearance of Christ, when he will be manifested from heaven as the Judge. The words, indeed, seem to have this meaning, but Paul does not mean that Christ would accomplish this (665) in one moment. Hence we must understand it in this sense — that Antichrist would be wholly and in every respect destroyed, (666) when that final day of the restoration of all things shall arrive. Paul, however, intimates that Christ will in the mean time, by the rays which he will emit previously to his advent, put to flight the darkness in which Antichrist will reign, just as the sun, before he is seen by us, chases away the darkness of the night by the pouring forth of his rays. (667)

This victory of the word, therefore, will shew itself in this world, for the spirit of his mouth simply means the word, as it also does in Isaiah 11:4, to which passage Paul seems to allude. For the Prophet there takes in the same sense the scepter of his mouth, and the breath of his lips, and he also furnishes Christ with these very arms, that he may rout his enemies. This is a signal commendation of true and sound doctrine — that it is represented as sufficient for putting an end to all impiety, and as destined to be invariably victorious, in opposition to all the machinations of Satan; as also when, a little afterwards, the proclamation of it is spoken of as Christ’s coming to us.

When Paul adds, the brightness of his coming, he intimates that the light of Christ’s presence will be such as will swallow up the darkness of Antichrist. In the mean time, he indirectly intimates, that Antichrist will be permitted to reign for a time, when Christ has, in a manner, withdrawn, as usually happens, whenever on his presenting himself we turn our back upon him. And, undoubtedly, that is a sad departure (668) of Christ, when he has taken away his light from men, which has been improperly and unworthily received, (669) in accordance with what follows. In the mean time Paul teaches, that by his presence alone all the elect of God will be abundantly safe, in opposition to all the subtleties of Satan.