Theophylact of Ohrid, on Heb 13:9

“Be not led away with various and strange doctrines. For it is best that the heart be established with grace, not with meats; which have not profited those that walk in them.”

“"Various," meaning now some, now others, and from some and from others, but foreign to right doctrine. For teaching may be "various," yet not "foreign," and therefore not counterfeit. But when teachings are various, that is, from one person one thing and from another something different, then they are also "foreign," that is, foreign to the truth, and then one must be on guard. For the truth is simple and has one aim. Pay attention to the expression "do not be carried away" — he speaks as if about those frivolous people who are easily carried away here and there. Here are strange doctrines. He hints at those who introduce the Jewish attachment to foods. So, he says that by "grace," that is, by faith, we must be strengthened and fully persuaded that nothing is unclean, but to the believer all things are clean. So what is needed is faith, not the observance of foods. For "those occupied with foods," that is, those who always followed the strict observance of rules about eating, brought no benefit to the soul, since they are alien to faith and slavishly serve a useless law. And in general, he says, what benefit did they receive from the observance of foods, when they were so defiled that they could not participate in the sacrifices?”

Imported from an open dataset — not yet checked against the printed edition.