John Chrysostom
Although destruction properly threatens you, the grief is common. See here too what prudence. He did not say this openly, although they had already truly been corrupted, as can be seen from the words, "when your obedience is fulfilled," and also, "lest I mourn over many who sinned before" (2 Cor 10:6; 12:21).
Yet he does not permit them to remain in hardness. Therefore he says, "lest somehow." He neither condemns nor keeps silent, since both are equally unsafe: to speak openly and to hide it completely.
Therefore he keeps the middle course, saying, "lest somehow." This is precisely how one speaks who neither condemns too much nor trusts too much, but holds the middle between the two.
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By these words, then, he calmed them. By the historical reminder of Eve, he brought them into unspeakable fear and took from them every occasion for excuse. For although the serpent was wicked and Eve lacking understanding, nevertheless nothing saved the woman from accusation.
"Therefore watch," says the Apostle, "lest you too suffer the same. Then nothing will defend you. And the serpent deceived precisely by promising much."
From this it is clear that the false teachers also deceived the Corinthians by boasting and puffing themselves up. The same conclusion can be drawn not only from this, but also from what follows.