Clement of Alexandria

The second Epistle of John, which is written to Virgins, is very simple. It was written to a Babylonian lady, by name Electa, and indicates the election of the holy Church. He establishes in this Epistle that the following out of the faith is not without charity, and so that no one divide Jesus Christ; but only to believe that Jesus Christ has come in the flesh. For he who has the Son by apprehension in his intellect knows also the Father, and grasps with his mind intelligibly the greatness of His power working without beginning of time.

He says, "If any come unto you and bring not this doctrine, receive him not into your house, neither bid him God speed; for he that bids him God speed is partaker of his evil deeds." He forbids us to salute such, and to receive them to our hospitality. For this is not harsh in the case of a man of this sort. But he admonishes them neither to confer nor dispute with such as are not able to handle divine things with intelligence, lest through them they be seduced from the doctrine of truth, influenced by plausible reasons. Now, I think that we are not even to pray with such, because in the prayer which is made at home, after rising from prayer, the salutation of joy is also the token of peace.