2 Timothy 3:9

9But they shall not proceed further He encourages Timothy for the contest, by the confident hope of victory; for, although false teachers give him annoyance, he promises that they shall be, within a short time, disgracefully ruined. (184) Yet the event does not agree with this promise; and the Apostle appears to make a totally different declaration, a little afterwards, when he says that they will grow worse and worse. Nor is there any force in the explanation given by Chrysostom, that they will grow worse every day, but will do no injury to any person; for he expressly adds, “deceived and deceiving;” and, indeed, the truth of this is proved by experience. It is more correct to say, that he looked at them in various aspects; for the affirmation, that they will not make progress, is not universal; but he only means, that the Lord will discover their madness to many whom they had, at first, deceived by their enchantments.

For their folly shall be manifest to all When he says, to all, it is by a figure of speech, in which the whole is taken for a part. And, indeed, they who are most successful in deceiving do, at first, make great boasting, and obtain loud applause; and, in short, it appears as if nothing were beyond their power. But speedily their tricks vanish into air; for the Lord opens the eyes of many, so that they begin to see what was concealed from them for a time. Yet never is the “folly” of false prophets discovered to such an extent as to be known to all. Besides, no sooner is one error driven away than new errors continually spring up.

Both admonitions are therefore necessary. That godly teachers may not despair, as if it were in vain for them to make war against error, they must be instructed about the prosperous success which the Lord will give to his doctrine. But that they may not think, on the other hand, that they are discharged from future service, after one or two battles, they must be reminded that there will always be new occasion for fighting. But on this second point we shall speak afterwards; at present, let it suffice us, that he holds out to Timothy the sure hope of a successful issue, that he may be time more encouraged to fight, And he confirms this by the example which he had quoted; for, as the truth of God prevailed against the tricks of the magicians, so he promises that the doctrine of the gospel shall be victorious against every kind of errors that may be invented.