John Chrysostom
Therefore, he says, rebuke them, because they have a bold, treacherous, and unbridled character. They are given over to countless vices. If they are inclined to lying, treacherous, gluttonous, and careless, then they need a strong and rebuking word. Such a man cannot be moved by meekness. Therefore "rebuke them." Here he speaks not of outsiders, but of his own. "Sharply." Strike them deeply, he says. For one must not treat everyone in the same way, but differently and variously, according to circumstances. In the present case he nowhere resorts to exhortations. By reproaching an obedient and noble man, one can kill and destroy him. So also by flattering a man who needs strong rebuke, one can spoil him and fail to bring him to correction.
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"That they may be sound," he says, "in the faith." Therefore health consists in introducing nothing false, nothing alien. If those who observe rules concerning food are not healthy, but sick and weak, for the Apostle says, "Receive one who is weak in faith, but not for disputes over opinions" (Rom 14:1), then what shall we say of those who fast and keep the Sabbath together with the Jews? Or what shall we say of those who go to places held sacred by the pagans? I mean the place in Daphne, the so-called cave of Matrona, and the place in Cilicia called that of Cronus. Can they be healthy? Therefore they need the strongest rebuke. But why does the Apostle not do the same with the Romans? Because their morals were not such, but nobler.