Aug 22, 2009
".... John, the Lord's disciple, went to take a bath at Ephesus, but, seeing Cerinthus inside, he rushed out of the bathhouse without bathing, crying, "Let's get out of here lest the place fall in: Cerinthus, the enemy of truth is inside!" Polycarp himself, when Marcion once met him and asked, "Don't you recognize me?" replied, "I do indeed: I recognize the firstborn of Satan!" So careful were the apostles and their disciples not even to converse with any mutilators of the truth, as Paul also said, "After a first and second admonition, have nothing more to do with anyone who causes divisions, since you know that such a person is perverted and sinful, being self-condemned" (Titus 3:10-11)". "
From Book 3 of Irenaeus's Against Heresies (Against Heresies 3.3)
Do we love the truth this much?