The Treatises of Cyprian: Three Books of Testimonies Against the Jews. 137That we must not speak with heretics.

Cyprian · The Ante-Nicene Fathers Volume V: The Fathers of the Third Century by Philip Schaff

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78. That we must not speak with heretics.

To Titus: "A man that is an heretic, after one rebuke avoid; knowing that one of such sort is perverted, and sinneth, and is by his own self condemned." Of this same thing in the Epistle of John: "They went out from among us, but they were not of us; for if they had been of us, they would doubtless have remained with us." Also in the second to Timothy: "Their word doth creep as a canker."