For such are false Apostles While he has already taken away from them what they chiefly desired, yet, not contented with having put himself on a level with them with respect to that in which they were desirous to excel, he leaves them nothing for which they deserve any commendation. It was apparently a laudable thing to despise money, but he says, that they make use of a pretense for the purpose of deceiving, exactly as if a harlot were to borrow the apparel of a decent matron. For it was necessary to pull off the mask, which obscured the glory of God. They are deceitful workers, says he, that is -- they do not discover their wickedness at first view, but artfully insinuate themselves under some fair pretext. [1] Hence they require to be carefully and thoroughly sifted, lest we should receive persons as servants of Christ, as soon as any appearance of excellence is discovered. Nor does Paul in malice and envy put an unfavorable construction upon what might be looked upon as an excellence, but, constrained by their dishonesty, he unfolds to view the evil that lay hid, because there was a dangerous profanation of virtue in pretending to burn with greater zeal than all the servants of Christ.

Footnotes

1 - "S'insinuent finement sans qu'on y prene garde;" -- "They artfully insinuate themselves, unless one be on his guard against them."

For such are false apostles - They have no claim to the apostolic office. They are deceivers. They pretend to be apostles; but they have no divine commission from the Redeemer. Paul had thus far argued the case without giving them an explicit designation as deceivers. But here he says that people who had conducted thus; who attempted to impose on the people; who had brought another gospel, whatever pretences they might have - and he was not disposed to deny that there was much that was plausible - were really impostors and the enemies of Christ. It is morally certain, from 2-Corinthians 11:22, that these people were Jews; but why they had engaged in the work of preaching, or why they had gone to Corinth, cannot with certainty be determined.
Deceitful workers - Impostors. People who practice various arts to impose on others. They were crafty, and fraudulent, and hypocritical. It is probable that they were people who saw that great advantage might be taken of the new religion; people who saw the power which it had over the people, and who saw the confidence which the new converts were inclined to repose in their teachers; perhaps people who had seen the disciples to the Christian faith commit all their property to the hands of the apostles, or who had heard of their doing it (compare Acts 4:34-35), and who supposed that by pretending to be apostles also they might come in for a share of this confidence, and avail themselves of this disposition to commit their property to their spiritual guides. To succeed, it was needful as far as possible to undermine the influence of the true apostles, and take their place in the confidence of the people. Thence they were "deceitful (δόλιοι dolioi) workers," full of trick, and cunning, and of plausible arts to impose on others.
Transforming themselves - Pretending to be apostles. Hypocritical and deceitful, they yet pretended to have been sent by Christ. This is a direct charge of hypocrisy. They knew they were deceivers; and yet they assumed the high claims of apostles of the Son of God.

For such are false apostles - Persons who pretend to be apostles, but have no mission from Christ.
Deceitful workers - They do preach and labor, but they have nothing but their own emolument in view.
Transforming themselves - Assuming as far as they possibly can, consistently with their sinister views, the habit, manner, and doctrine of the apostles of Christ.

(6) For such [are] false apostles, deceitful workers, transforming themselves into the apostles of Christ.
(6) Now at length he portrays these fellows as they truly are, forewarning that it will come to pass that they will at length betray themselves, no matter how they may be pretending that they have a zeal for God's glory.

For such are false apostles,.... Such as those he had in view, who sought an occasion to depress him, and exalt themselves, and to get money from the Corinthians; these were "false apostles", or apostles falsely so called; they had the name, but not the thing; they were not called and sent forth by Christ; they had not the grace of apostleship, or gifts qualifying them for that high office; the power and authority they exercised was usurped by them; they could not prove their mission by true and real miracles; nor had they any seals of their apostleship, as those who were sent by Christ had:
deceitful workers; they went by the name of labourers in Christ's vineyard, when they were loiterers in it; they pretended to work, but did not; and to work for Christ, when they only served themselves, and their own bellies; they took upon them to interpret the Scriptures, but in a very fallacious manner; they walked in craftiness, and handled the word of God deceitfully, and lay in wait to deceive men; and were masters of so much art and cunning, that, if it was possible, they would have deceived the very elect:
transforming themselves into the apostles of Christ: not so much by putting on a like garb or dress, but by pretending to be of the same principles, and to follow their practices, and to pursue the same good ends in their ministrations.

For--reason why he is unwilling they should be thought like him [BENGEL].
such--they and those like them.
false apostles--those "overmuch apostles" (see on 2-Corinthians 11:5) are no apostles at all.
deceitful workers--pretending to be "workmen" for the Lord, and really seeking their own gain.

Such are false apostles. He now tears off the mask. These men are not real, but false apostles, deceitful workers, pretending to be Christ's apostles.
And no marvel. Is it said that they appear to be Christ's ministers? Even Satan can take the shape of an angel of light. He always seeks to destroy by coming in a false guise.
Therefore it is no great thing if his ministers, etc. It is not strange if persons really doing Satan's work should appear as ministers of righteousness. The sorest wounds of the church are not found from without, but from agents of Satan within.