John Chrysostom
What are you saying? Are those who preach Christ, take no money, and introduce no other gospel false apostles? Yes, says Paul. They are false apostles above all for this reason: they do everything hypocritically, in order to deceive. They are deceitful workers. They labor, but they tear up what has been planted. Since they know that otherwise they would not be received, they put on the mask of truth and hide beneath it the work of deception. The Apostle says that they do not take money in order to receive something greater: to destroy the soul. More precisely, even this is false. They took money, but only secretly, as the Apostle shows later.
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He had already hinted at this when he said, "that wherein they boast, they may be found even as we." Later he indicated it more clearly, saying: "You endure it if someone devours you, if someone takes from you, if someone exalts himself" (2 Cor 11:20). Now he also exposes them in another matter, saying: "they disguise themselves." They have only a mask; they are covered with sheepskin.