The guiding principles in the Church’s treatment of heretics are the following: Distinguishing between formal and material heretics, she applies to the former the canon, “Most firmly hold and in no way doubt that every heretic or schismatic is to have part with the Devil and his angels in the flames of eternal fire, unless before the end of his life he be incorporated with, and restored to the Catholic Church.”
What Paul did at Corinth he enjoins to be done by every bishop in his own church. Thus Timothy is instructed to “war in them a good warfare, having faith and a good conscience, which some rejecting have made shipwreck concerning the faith. Of whom is Hymeneus and Alexander, whom I have delivered up to Satan, that they may learn not to blaspheme” (1 Timothy 1:18-20). He exhorts the ancients of the Church at Ephesus to “take heed to yourselves, and to the whole flock, wherein the Holy Ghost hath placed you bishops, to rule the Church of God, . . . I know that, after my departure, ravening wolves will enter in among you, not sparing the flock . . . Therefore watch, . . .” (Acts 20:28-31). “Beware of dogs”, he writes to the Philippians (3:2), the dogs being the same false teachers as the “ravening wolves”. The Fathers show no more leniency to perverters of the faith. A Protestant writer thus sketches their teaching (Schaff-Herzog, s.v. Heresy): “Polycarp regarded Marcion as the first-born of the Devil. Ignatius sees in heretics poisonous plants, or animals in human form. Justin and Tertullian condemn their errors as inspirations of the Evil One; Theophilus compares them to barren and rocky islands on which ships are wrecked; and Origen says, that as pirates place lights on cliffs to allure and destroy vessels in quest of refuge, so the Prince of this world lights the fires of false knowledge in order to destroy men. [Jerome calls the congregations of the heretics synagogues of Satan (Ep. 123), and says their communion is to be avoided like that of vipers and scorpions (Ep. 130).]” These primitive views on heresy have been faithfully transmitted and acted on by the Church in subsequent ages. There is no break in the tradition from St. Peter to Pius X.
