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.” 4540 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.” 4541 Also in the second to Timothy: “Their word doth creep as a canker.” 4542 4540     Tit. iii. 10, 11 . 4541     1 John ii. 19 . 4542     2 Tim. ii. 17 .