Such estrangement from those who differ in faith, and such aversion toward them, may cause perplexity. Some sectarians, for example from among our schismatic sects, understand the Apostle's saying literally and try to observe complete separation in food and drink from those who differ in faith.
Meanwhile, the Apostle commands not so much outward separation from heretics as spiritual and moral separation. For after saying, "Do not greet him," that is, the heretic, the Apostle explains himself with the following words: "For he who greets him shares in his evil works" (2 Jn 11).
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This last saying clearly shows what the Apostle forbids. He does not forbid greetings that are accidental and, so to speak, passing expressions of generally accepted and conventional courtesy toward people differing in faith. Schismatics avoid even these, although no participation in evil deeds arises from them. Rather, he forbids close and friendly relations with them, which may arise and grow strong especially from hospitable feasting.