But they shall proceed no further: for their folly shall be manifest unto all men, as theirs also was.
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Augustine of Hippo
AD 430
For those whom the Manichaeans lead astray are Christians who have already been born of the gospel, whose profession has been misled by the heretics. They make riches with inconsiderate haste but without good judgment. They do not consider that the followers whom they gather as their riches are taken from the genuine original Christian society and deprived of its benefits…. This recalls what the prophet said of the partridge, which gathers what it has not brought forth, “In the midst of his days they shall leave him, and in the end he shall be a fool.” In other words, he who at first misled people by a promising display of superior wisdom shall be a fool, that is, shall be seen to be a fool. He will be seen when his folly is manifest to all, and those to whom he was at first a wise man he will then be a fool.
But they shall proceed no farther. How doth this agree with ver. 13., where it is said, that seducers shall grow worse and worse? or with what he said in the last chapter, (ver. 17.) that their talk spreadeth like a cancer? We may answer, that the heretics became worse, and seduced very many in all ages, but the providence of God always put a stop to their progress, so that they could never prevail against the Church, as they hoped and proposed to do. (Witham)
St. Paul shows what will be the fate of all heresies; and the annals of the Church prove good his words, that they will appear to flourish for a time, and then will die away and be forgotten.
For if errors flourish at first, they do not continue to the end, for so it is with things that are not fair by nature but fair in appearance. They flourish for a time and then are detected and come to nothing. But this does not happen to our teaching. Of this you are a witness. For in our doctrines there is no deceit. For who would choose to die for a deceit? Homilies on Timothy
They shall proceed no further; how then does he say elsewhere, They will increase unto more ungodliness? 2 Timothy 2:16 He there means, that beginning to innovate and to deceive, they will not pause in their error, but will always invent new deceits and corrupt doctrines, for error is never stationary. But here he says, that they shall not be able to deceive, nor carry men away with them, for however at first they may seem to impose upon them, they will soon and easily be detected. For that he is speaking to this effect appears from what follows. For their folly shall be manifest unto all. Whence? Every way— as theirs also was. For if errors flourish at first, they do not continue to the end, for so it is with things that are not fair by nature, but fair in appearance; they flourish for a time, and then are detected, and come to nought. But not such are our doctrines, and of these you are a witness, for in our doctrines there is no deceit, for who would choose to die for a deceit?