John Chrysostom
“Such people,” says the Apostle, “serve not our Lord Jesus Christ, but their own belly.” Thus there would be neither scandals nor division if doctrine contrary to apostolic doctrine had not been invented.
Pointing to this, the Apostle says here, “contrary to the doctrine.” He did not say, “which we taught,” but, “which you learned.”
By this he anticipates them and shows that they were fully convinced, heard, and received the doctrine.
Then, rebuking those who dare to introduce division, he also shows the cause of their action, saying, “Such people serve not the Lord, but their own belly.”
He said the same in the Epistle to the Philippians: “their god is the belly,” Phil 3:19.
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Here, I think, the Apostle hints at those converted from the Jews, whom he usually always rebukes for excessive gluttony.
In the Epistle to Titus he also said of them, “evil beasts, lazy bellies,” Titus 1:12.
Christ likewise accuses them of this, saying, “You devour widows’ houses,” Mt 23:14.
The prophets accused them of the same. It is said, “He grew fat, thick, and sleek, and forsook God,” Deut 32:15.
Therefore Moses also exhorted them thus: “You shall eat and be satisfied; beware lest you forget the Lord,” Deut 6:11-12.
According to the Gospel’s testimony, the Jews said to Christ, “What sign do You show us?” Jn 2:18. Leaving all else aside, they mention only the manna.
Thus from everything one can see that the Jews were infected with the passion of gluttony.
How then should a brother of Christ not be ashamed to have slaves of the belly as teachers?
Therefore gluttony is the cause of error. The method of evil design is another disease again, namely flattery.
“By flattery and fair speech they deceive the hearts of the simple,” says the Apostle. Well said: “fair speech.”
The services of flatterers are only on the lips. Their heart is not so, but is full of deceit.
Further, the Apostle did not say, “they deceive you,” but, “the hearts of the simple.” He did not even stop at this.
So that his words would not seem too harsh, he continues, “your obedience in the faith is known to all,” Rom 16:19.