John Chrysostom
“Do not be carried away by various and strange teachings.” He wants them not to be carried away by teachings that are not only strange, but also various. He knew that destruction comes from both to those who are carried away. “For it is good that the heart be established by grace, not by foods, which have not profited those occupied with them.” Here he alludes to those who prescribe rules concerning food. For faith all things are pure. Faith is needed, not foods. [...] “Do not be carried away by various and strange teachings,” that is, teachings contrary to what you heard from us. “Various” means diverse. Such teachings have nothing firm within them, but are discordant, especially concerning distinctions in food.
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Therefore he points directly to this when he continues: “it is good that the heart be established by grace, not by foods.” Such teachings are various. Such teachings are strange. Here he condemns superstitious distinction among foods and shows that by such observance they fell into alien belief. They were carried away by various and strange teachings. And note that he does not venture to say this directly, but speaks covertly: “Do not be carried away by various and strange teachings,” and, “it is good that the heart be established by grace. Not by foods.” This is almost the same as what Christ said: “Not what enters the mouth defiles a man, but what comes out of the mouth defiles a man” (Mt 15:11). He proves that faith is everything. If faith establishes, then the heart is secure. Faith establishes, while reason wavers, because faith is contrary to reason. “Which,” he says, “have not profited those occupied with them.” Tell me, what benefit is there from such distinction? Does it not cause more harm? Does it not cast such a man into sin? If one must beware of anything, it is of what benefits those who beware. It is good to beware of evil, to preserve uprightness of heart, reverence toward God, and right faith. “Which,” he says, “have not profited those occupied with them,” that is, those who have always observed them. One observance is praiseworthy: abstinence from sin. But what benefit is there when some are so unclean that they cannot partake of the sacrifice? Nothing saves them, although they strive to keep themselves from certain foods. This will not help them at all, because they do not have faith.