On Heresy

Gal 5:19-21

Now the works of the flesh are clearly revealed, which are: adultery, fornication, uncleanness, lustfulness, idolatry, sorcery, enmities, fightings, jealousies, angers, rivalries, divisions, heresies, envyings, murders, drunkenness, revelings, and things like these; of which I tell you beforehand, as I also said before, that the ones practicing such things will not inherit the kingdom of God.

The word “heresy” is from the Greek word αἵρεσις (hairesis), a word meaning choice, course of action or in a extended sense, school of thought and hence inherently implies a conscious, deliberate and willful rejection or opposition to the Divine Truth manifest in the Orthodox Church.

St. Ignatius of Antioch ca.45-107

Do not err, my brethren. (Comp. Jam. 1:16) Those that corrupt families shall not inherit the kingdom of God. (1Cor. 6:9-10) If, then, those who do this as respects the flesh have suffered death, how much more shall this be the case with any one who corrupts by wicked doctrine the faith of God, for which Jesus Christ was crucified! Such an one becoming defiled [in this way], shall go away into everlasting fire, and so shall every one that hearkens unto him. (Ephesians 16)

I therefore, yet not I, but the love of Jesus Christ, entreat you that ye use Christian nourishment only, and abstain from herbage of a different kind; I mean heresy. For heretics mix up Jesus Christ with their own poison, speaking things which are unworthy of credit, like those who administer a deadly drug in sweet wine, which he who is ignorant of does greedily take, with a fatal pleasure leading to his own death. (Trallians 6)

St. Irenaeus of Lyons died ca. 202

There are also those who heard from him (St. Polycarp) that John, the disciple of the Lord, going to bathe at Ephesus, and perceiving Cerinthus within, rushed out of the bath-house without bathing, exclaiming, “Let us fly, lest even the bath-house fall down, because Cerinthus, the enemy of the truth, is within.” And Polycarp himself replied to Marcion, who met him on one occasion, and said, “Dost thou know me?” “I do know thee, the first-born of Satan.” Such was the horror which the Apostles and their disciples had against holding even verbal communication with any corrupters of the truth; as Paul also says, “A man that is an heretic, after the first and second admonition, reject; knowing that he that is such is subverted, and sinneth, being condemned of himself.” (Tit. 3:10) (Against Heresies 3.3.4)

Wherefore it is incumbent to obey the presbyters who are in the Church, — those who, as I have shown, possess the succession from the Apostles; those who, together with the succession of the episcopate, have received the certain gift of truth, according to the good pleasure of the Father. But [it is also incumbent] to hold in suspicion others who depart from the primitive succession, and assemble themselves together in any place whatsoever, [looking upon them] either as heretics of perverse minds, or as schismatics puffed up and self-pleasing, or again as hypocrites, acting thus for the sake of lucre and vainglory. For all these have fallen from the truth. And the heretics, indeed, who bring strange fire to the altar of God — namely, strange doctrines — shall be burned up by the fire from heaven, as were Nadab and Abiud. (Lev. 10:1, Lev. 10:2) But such as rise up in opposition to the truth, and exhort others against the Church of God, [shall] remain among those in hades (apud inferos), being swallowed up by an earthquake, even as those who were with Chore, Dathan, and Abiron. (Num. 16:33) But those who cleave asunder, and separate the unity of the Church, [shall] receive from God the same punishment as Jeroboam did. (1Kgs. 14:10) (ibid., 4.26.2)

Now all these [heretics] are of much later date than the bishops to whom the apostles committed the Churches; which fact I have in the third book taken all pains to demonstrate. It follows, then, as a matter of course, that these heretics aforementioned, since they are blind to the truth, and deviate from the [right] way, will walk in various roads; and therefore the footsteps of their doctrine are scattered here and there without agreement or connection. But the path of those belonging to the Church circumscribes the whole world, as possessing the sure tradition from the Apostles, and gives unto us to see that the faith of all is one and the same, since all receive one and the same God the Father, and believe in the same dispensation regarding the incarnation of the Son of God, and are cognizant of the same gift of the Spirit, and are conversant with the same commandments, and preserve the same form of ecclesiastical constitution, and expect the same advent of the Lord, and await the same salvation of the complete man, that is, of the soul and body. (ibid., 5.20.1)

Clement of Alexandria ca. 150-215

Accordingly it is added: “For he hath forsaken the ways of his own vineyard, and wandered in the tracks of his own husbandry.” Such are the sects which deserted the primitive Church. Now he who has fallen into heresy passes through an arid wilderness, abandoning the only true God, destitute of God, seeking waterless water, reaching an uninhabited and thirsty land, collecting sterility with his hands. And those destitute of prudence, that is, those involved in heresies, “I enjoin,” remarks Wisdom, saying, “Touch sweetly stolen bread and the sweet water of theft;” the Scripture manifestly applying the terms bread and water to nothing else but to those heresies, which employ bread and water in the oblation, not according to the canon of the Church. For there are those who celebrate the Eucharist with mere water. “But begone, stay not in her place:” place is the synagogue, not the Church. He calls it by the equivocal name, place. Then He subjoins: “For so shalt thou pass through the water of another;” reckoning heretical baptism not proper and true water. “And thou shalt pass over another’s river,” that rushes along and sweeps down to the sea; into which he is cast who, having diverged from the stability which is according to truth, rushes back into the heathenish and tumultous waves of life. (Stromata Bk. 1 Chap. 19)

Tertullian ca. 160-220

Since this is the case, in order that the truth may be adjudged to belong to us, as many as walk according to the rule, which the church has handed down from the Apostles, the Apostles from Christ, and Christ from God, the reason of our position is clear, when it determines that heretics ought not to be allowed to challenge an appeal to the Scriptures, since we, without the Scriptures, prove that they have nothing to do with the Scriptures. For as they are heretics, they cannot be true Christians, because it is not from Christ that they get that which they pursue of their own mere choice, and from the pursuit incur and admit the name of heretics. Thus, not being Christians, they have acquired no right to the Christian Scriptures; and it may be very fairly said to them, Who are you? When and whence did you come? As you are none of mine, what have you to do with that which is mine?  (Prescription Against Heretics 37)

I must not omit an account of the conduct also of the heretics— how frivolous it is, how worldly, how merely human, without seriousness, without authority, without discipline, as suits their creed. To begin with, it is doubtful who is a catechumen, and who a believer; they have all access alike, they hear alike, they pray alike— even heathens, if any such happen to come among them. That which is holy they will cast to the dogs, and their pearls, although (to be sure) they are not real ones, they will fling to the swine. Simplicity they will have to consist in the overthrow of discipline, attention to which on our part they call brothelry. Peace also they huddle up anyhow with all comers; for it matters not to them, however different be their treatment of subjects, provided only they can conspire together to storm the citadel of the one only Truth. All are puffed up, all offer you knowledge. Their catechumens are perfect before they are full-taught. The very women of these heretics, how wanton they are! For they are bold enough to teach, to dispute, to enact exorcisms, to undertake cures— it may be even to baptize. Their ordinations, are carelessly administered, capricious, changeable. At one time they put novices in office; at another time, men who are bound to some secular employment; at another, persons who have apostatized from us, to bind them by vainglory, since they cannot by the truth. Nowhere is promotion easier than in the camp of rebels, where the mere fact of being there is a foremost service. And so it comes to pass that today one man is their bishop, tomorrow another; today he is a deacon who tomorrow is a reader; today he is a presbyter who tomorrow is a layman. For even on laymen do they impose the functions of priesthood. (ibid., 41)

St. Hippolytus of Rome ca. 170-235

Do not devote your attention to the fallacies of artificial discourses, nor the vain promises of plagiarizing heretics, but to the venerable simplicity of unassuming truth. (Refutation of All Heresies Bk. X Chap. 30)

St. Methodius of Olympus died ca. 311

The dragon, which is great, and red, and cunning, and manifold, and seven-headed, and horned, and draws down the third part of the stars, and stands ready to devour the child of the woman who is travailing, is the devil, who lies in wait to destroy the Christ-accepted mind of the baptized, and the image and clear features of the Word which had been brought forth in them. But he misses and fails of his prey, the regenerate being caught up on high to the throne of God—that is, the mind of those who are renovated is lifted up around the divine seat and the basis of truth against which there is no stumbling, being taught to look upon and regard the things which are there, so that it may not be deceived by the dragon weighing them down. For it is not allowed to him to destroy those whose thoughts and looks are upwards. And the stars, which the dragon touched with the end of his tail, and drew them down to earth, are the bodies of heresies; for we must say that the stars, which are dark, obscure, and falling, are the assemblies of the heterodox; since they, too, wish to be acquainted with the heavenly ones, and to have believed in Christ, and to have the seat of their soul in heaven, and to come near to the stars as children of light. But they are dragged down, being shaken out by the folds of the dragon, because they did not remain within the triangular forms of godliness, falling away from it with respect to an orthodox service. Whence also they are called the third part of the stars, as having gone astray with regard to one of the three Persons of the Trinity. As when they say, like Sabellios, that the Almighty Person of the Father Himself suffered; or as when they say, like Artemas, that the Person of the Son was born and manifested only in appearance; or when they contend, like the Ebionites, that the prophets spoke of the Person of the Spirit, of their own motion. For of Marcion and Valentinus, and those about Elkesaios and others, it is better not even to make mention. (Banquet of the Ten Virgins Discourse 8, Chap. 10)

St. Athanasius of Alexandria ca. 293-373

Yes surely; while all of us are and are called Christians after Christ, Marcion broached a heresy a long time since and was cast out; and those who continued with him who ejected him remained Christians; but those who followed Marcion were called Christians no more, but henceforth Marcionites. Thus Valentinus also, and Basilides, and Manichæus, and Simon Magus, have imparted their own name to their followers; and some are accosted as Valentinians, or as Basilidians, or as Manichees, or as Simonians; and other, Cataphrygians from Phrygia, and from Novatus Novatians. So too Meletius, when ejected by Peter the Bishop and Martyr, called his party no longer Christians, but Meletians , and so in consequence when Alexander of blessed memory had cast out Arius, those who remained with Alexander, remained Christians; but those who went out with Arius, left the Saviour’s Name to us who were with Alexander, and as to them they were hence-forward denominated Arians. Behold then, after Alexander’s death too, those who communicate with his successor Athanasius, and those with whom the said Athanasius communicates, are instances of the same rule; none of them bear his name, nor is he named from them, but all in like manner, and as is usual, are called Christians. For though we have a succession of teachers and become their disciples, yet, because we are taught by them the things of Christ, we both are, and are called, Christians all the same. But those who follow the heretics, though they have innumerable successors in their heresy, yet anyhow bear the name of him who devised it. Thus, though Arius be dead, and many of his party have succeeded him, yet those who think with him, as being known from Arius, are called Arians. And, what is a remarkable evidence of this, those of the Greeks who even at this time come into the Church, on giving up the superstition of idols, take the name, not of their catechists, but of the Saviour, and begin to be called Christians instead of Greeks: while those of them who go off to the heretics, and again all who from the Church change to this heresy, abandon Christ’s name, and henceforth are called Arians, as no longer holding Christ’s faith, but having inherited Arius’s madness. (Discourse 1 Against the Arians, 3)

Then was fulfilled that which was spoken by the prophet; ‘I will take away from them the voice of joy and the voice of gladness, the voice of the bridegroom and the voice of the bride, the scent of myrrh, and the light of a lamp, and the whole land shall be destroyed.’ (Jer. 25:10) For the whole service of the law has been abolished from them, and henceforth and for ever they remain without a feast. And they observe not the Passover; for how can they? They have no abiding place, but they wander everywhere. And they eat unleavened bread contrary to the law, since they are unable first to sacrifice the lamb, as they were commanded to do when eating unleavened bread. But in every place they transgress the law, and as the judgments of God require, they keep days of grief instead of gladness. Now the cause of this to them was the slaying of the Lord, and that they did not reverence the Only-Begotten. At this time the altogether wicked heretics and ignorant schismatics are in the same case; the one in that they slay the Word, the other in that they rend the coat. They too remain expelled from the feast, because they live without godliness and knowledge, and emulate the conduct shewn in the matter of Bar-Abbas the robber, whom the Jews desired instead of the Saviour. (Festal Letter 6.6)

St. Hilary Poitiers ca. 300-368

But I trust that the Church, by the light of her doctrine, will so enlighten the world’s vain wisdom, that, even though it accept not the mystery of the faith, it will recognise that in our conflict with heretics we, and not they, are the true representatives of that mystery. For great is the force of truth; not only is it its own sufficient witness, but the more it is assailed the more evident it becomes; the daily shocks which it receives only increase its inherent stability. It is the peculiar property of the Church that when she is buffeted she is triumphant, when she is assaulted with argument she proves herself in the right, when she is deserted by her supporters she holds the field. It is her wish that all men should remain at her side and in her bosom; if it lay with her, none would become unworthy to abide under the shelter of that august mother, none would be cast out or suffered to depart from her calm retreat. But when heretics desert her or she expels them, the loss she endures, in that she cannot save them, is compensated by an increased assurance that she alone can offer bliss. This is a truth which the passionate zeal of rival heresies brings into the clearest prominence. The Church, ordained by the Lord and established by His Apostles, is one for all; but the frantic folly of discordant sects has severed them from her. And it is obvious that these dissensions concerning the faith result from a distorted mind, which twists the words of Scripture into conformity with its opinion, instead of adjusting that opinion to the words of Scripture. And thus, amid the clash of mutually destructive errors, the Church stands revealed not only by her own teaching, but by that of her rivals. They are ranged, all of them, against her; and the very fact that she stands single and alone is her sufficient answer to their godless delusions. The hosts of heresy assemble themselves against her; each of them can defeat all the others, but not one can win a victory for itself. The only victory is the triumph which the Church celebrates over them all. Each heresy wields against its adversary some weapon already shattered, in another instance, by the Church’s condemnation. There is no point of union between them, and the outcome of their internecine struggles is the confirmation of the faith. (On the Trinity Bk. 7,4)

St. Cyril of Jerusalem ca. 313-386

But since the word Ecclesia is applied to different things (as also it is written of the multitude in the theatre of the Ephesians, And when he had thus spoken, he dismissed the Assembly), and since one might properly and truly say that there is a Church of evil doers, I mean the meetings of the heretics, the Marcionists and Manichees, and the rest, for this cause the Faith has securely delivered to thee now the Article, “And in one Holy Catholic Church;” that thou mayest avoid their wretched meetings, and ever abide with the Holy Church Catholic in which thou wast regenerated. And if ever thou art sojourning in cities, inquire not simply where the Lord’s House is (for the other sects of the profane also attempt to call their own dens houses of the Lord), nor merely where the Church is, but where is the Catholic Church. For this is the peculiar name of this Holy Church, the mother of us all, which is the spouse of our Lord Jesus Christ, the Only-begotten Son of God (for it is written, As Christ also loved the Church and gave Himself for it, and all the rest,) and is a figure and copy of Jerusalem which is above, which is free, and the mother of us all; which before was barren, but now has many children.(Cathechetical Lectures 18.26)

St. Gregory Nazianzus ca. 329-390

Yea! Would that I were one of those who contend and incur hatred for the truth’s sake: or rather, I can boast of being one of them. For better is a laudable war than a peace which severs a man from God: and therefore it is that the Spirit arms the gentle warrior, as one who is able to wage war in a good cause. (Oration 2.82)

St. Basil of Caesarea ca. 330-379

As for all those who pretend to confess sound Orthodox Faith, but are in communion with people who hold a different opinion, if they are forewarned and still remain stubborn, you must not only not be in communion with them, but you must not even call them brothers. (Patrologia Orientalis, Vol. 17, p. 303)

Abba Agathon ca. 4th cent.

Several brothers once visited Abba Agathon, for they had been informed that he was possessed of great spiritual discretion. And wishing to test him, to see if he would become angry, they said: “Are you Agathon? We have heard about you that you are debauched and proud.” He replied, “Yes, it is so.” They said to him once more, “Are you Agathon the loose-tongued lover of slander?” “I am he,” he responded. And the visitors spoke to him a third time, “You are Agathon, the heretic?” To this, he answered, “I am not a heretic.” After this answer, they asked him to explain: “Why, when we called you so many things, did you admit them, while you would not, however, endure the accusation that you were a heretic?” And the Abba said to them: “The first things I accepted since they were beneficial for my soul; but not the accusation that I am a heretic, since heresy is separation from God.” On hearing this reply, the visitors marvelled at the spiritual discretion of the Abba and departed, benefitted in soul. (The Sayings of the Desert Fathers: Agathon 5)

Abba Poemen the Great ca. 4th cent.

Some heretics came to Abba Poemen one day and began to speak evil of the archbishop of Alexandria suggesting that he had received the laying on of hands from priests. The old man, who had remained silent till then, called his brother and said, ‘Set the table, give them something to eat and send them away in peace.’ (ibid., Abba Poemen 78)

Abba Theodore ca. 4th cent.

He also said, ‘If you are friendly with someone who happens to fall into the temptation of fornication, offer him your hand, if you can, and deliver him from it. But if he falls into heresy and you cannot persuade him to turn from it, seperate yourself quickly from him, in case, if you delay, you too may be dragged down with him into the pit. (ibid., Theodore of Pherme 4)

Blessed Jerome ca. 347-420

Heretics bring sentence upon themselves since they by their own choice withdraw from the Church, a withdrawal which, since they are aware of it, constitutes damnation. Between heresy and schism there is this difference: that heresy involves perverse doctrine, while schism separates one from the Church on account of disagreement with the bishop. Nevertheless, there is no schism which does not trump up a heresy to justify its departure from the Church. (Commentary on Titus 3:10–11)

St. John Chrysostom ca. 349-407

They (the Galatians) had, in fact, only introduced one or two commandments, circumcision and the observance of days, but he says that the Gospel was subverted, in order to show that a slight adulteration vitiates the whole. For as he who but partially pares away the image on a royal coin renders the whole spurious, so he who swerves ever so little from the pure faith, soon proceeds from this to graver errors, and becomes entirely corrupted. Where then are those who charge us with being contentious in separating from heretics, and say that there is no real difference between us except what arises from our ambition? Let them hear Paul’s assertion, that those who had but slightly innovated, subverted the Gospel. Not to say that the Son of God is a created Being, is a small matter. Know you not that even under the elder covenant, a man who gathered sticks on the sabbath, and transgressed a single commandment, and that not a great one, was punished with death? Numbers 15:32-36 and that Uzzah, who supported the Ark when on the point of being overturned, was struck suddenly dead, because he had intruded upon an office which did not pertain to him? 2 Samuel 6:6-7 Wherefore if to transgress the sabbath, and to touch the falling Ark, drew down the wrath of God so signally as to deprive the offender of even a momentary respite, shall he who corrupts unutterably awful doctrines find excuse and par don? Assuredly not. A want of zeal in small matters is the cause of all our calamities; and because slight errors escape fitting correction, greater ones creep in. As in the body, a neglect of wounds generates fever, mortification, and death; so in the soul, slight evils overlooked open the door to graver ones. It is accounted a trivial fault that one man should neglect fasting; that another, who is established in the pure faith, dissembling on account of circumstances, should surrender his bold profession of it, neither is this anything great or dreadful; that a third should be irritated, and threaten to depart from the true faith, is excused on the plea of passion and resentment. Thus a thousand similar errors are daily introduced into the Church, and we have become a laughing-stock to Jews and Greeks, seeing that the Church is divided into a thousand parties. But if a proper rebuke had at first been given to those who attempted slight perversions, and a deflection from the divine oracles, such a pestilence would not have been generated, nor such a storm have seized upon the Churches. (Homily 1 on Galatians)

Blessed Augustine of Hippo ca. 354-430

The Apostle Paul has said: A man that is an heretic after the first and second admonition reject, knowing that he that is such is subverted and sins, being condemned of himself. Titus 3:10-11 But though the doctrine which men hold be false and perverse, if they do not maintain it with passionate obstinacy, especially when they have not devised it by the rashness of their own presumption, but have accepted it from parents who had been misguided and had fallen into error, and if they are with anxiety seeking the truth, and are prepared to be set right when they have found it, such men are not to be counted heretics. Were it not that I believe you to be such, perhaps I would not write to you. And yet even in the case of a heretic, however puffed up with odious conceit, and insane through the obstinacy of his wicked resistance to truth, although we warn others to avoid him, so that he may not deceive the weak and inexperienced, we do not refuse to strive by every means in our power for his correction. (Letters 43,1)

We believe also in the holy Church, that is, the Catholic Church. For both heretics and schismatics style their congregations churches. For heretics violate the faith itself by a false opinion about God; schismatics, however, withdraw from fraternal love by hostile separations, although they believe the same things we do. Consequently, neither heretics nor schismatics belong to the Catholic Church; not heretics, because the Church loves God; and not schismatics, because the Church loves neighbor. (Faith and the Creed 10:21)

St. John Cassian ca. 360-435

Tell me, I pray, if any Jew or pagan denied the Creed of the Catholic faith, should you think that we ought to listen to him? Most certainly not. What if a heretic or an apostate does the same? Still less should we listen to him, for it is worse for a man to forsake the truth which he has known, than to deny it without ever having known it. (On the Incarnation Bk. VI Chap. 10)

For the scheme of the mysteries of the Church and the Catholic faith is such that one who denies one portion of the Sacred Mystery cannot confess the other. For all parts of it are so bound up and united together that one cannot stand without the other and if a man denies one point out of the whole number, it is of no use for him to believe all the others. (ibid., Bk. VI Chap. 17)

St. Vincent of Lerins died ca. 445

I have often then inquired earnestly and attentively of very many men eminent for sanctity and learning, how and by what sure and so to speak universal rule I may be able to distinguish the truth of Catholic faith from the falsehood of heretical pravity; and I have always, and in almost every instance, received an answer to this effect: That whether I or any one else should wish to detect the frauds and avoid the snares of heretics as they rise, and to continue sound and complete in the Catholic faith, we must, the Lord helping, fortify our own belief in two ways; first, by the authority of the Divine Law, and then, by the Tradition of the Catholic Church. (The Commonitory, Chap. 2)

Here, possibly, some one may ask, ‘Do heretics also appeal to Scripture?’ They do indeed, and with a vengeance; for you may see them scamper through every single book of Holy Scripture,—through the books of Moses, the books of Kings, the Psalms, the Epistles, the Gospels, the Prophets. Whether among their own people, or among strangers, in private or in public, in speaking or in writing, at convivial meetings, or in the streets, hardly ever do they bring forward anything of their own which they do not endeavour to shelter under words of Scripture. Read the works of Paul of Samosata, of Priscillian, of Eunomius, of Jovinian, and the rest of those pests, and you will see an infinite heap of instances, hardly a single page, which does not bristle with plausible quotations from the New Testament or the Old.

But the more secretly they conceal themselves under shelter of the Divine Law, so much the more are they to be feared and guarded against. For they know that the evil stench of their doctrine will hardly find acceptance with any one if it be exhaled pure and simple. They sprinkle it over, therefore, with the perfume of heavenly language, in order that one who would be ready to despise human error, may hesitate to condemn divine words. They do, in fact, what nurses do when they would prepare some bitter draught for children; they smear the edge of the cup all round with honey, that the unsuspecting child, having first tasted the sweet, may have no fear of the bitter. So too do these act, who disguise poisonous herbs and noxious juices under the names of medicines, so that no one almost, when he reads the label, suspects the poison. (ibid., 25)

St. Maximus the Confessor ca. 580-662

I write these things not wishing to cause distress to the heretics or to rejoice in their ill-treatment — God forbid; but, rather, rejoicing and being gladdened at their return. For what is more pleasing to the faithful than to see the scattered children of God gathered again as one? Neither do I exhort you to place harshness above the love of men. May I not be so mad! I beseech you to do and to carry out good to all men with care and assiduity, becoming all things to all men, as the need of each is shown to you; I want and pray you to be wholly harsh and implacable with the heretics only in regard to cooperating with them or in any way whatever supporting their deranged belief. For I reckon it hatred towards man and a departure from divine love to lend support to error, so that those previously seized by it might be even more greatly corrupted. (Patrologia Graeca, Vol. 91 col. 465c)

St. John Climacus ca. 7th cent.

A transgressor is someone who observes the divine law only in his own depraved fashion and holds heretical belief in opposition to God. (The Ladder of Divine Ascent, Step 1)

A very well-informed man once put this question to me: “Leaving aside murder and the denial of God, what is the most serious of sins?”

“To lapse into heresy,” I replied.

(ibid., Step 15)

Snow cannot burst into flames. It is even less possible for humility to abide in a heretic. This achievement belongs only to the pious and the faithful, and then only when they have been purified. (ibid., Step 25)

In any conflict with unbelievers or heretics, we should stop after we have twice reproved them (cf. Tit. 3:10). But where we are dealing with those eager to learn the truth, we should never grow tired of doing the right thing (cf. Gal. 6:9). And we should use both situations to test our own steadfastness. (ibid., Step 26)

St. Isaac the Syrian died ca. 700

Beware of reading the doctrines of heretics for they, more than anything else, can arm the spirit of blasphemy against you. (The Ascetical Homilies, Homily Four)

Bede the Venerable ca. 673-735

All heretics distort the Scriptures, for there is no book either of the Old or New Testament in which they do not understand many things perversely. But they also often twist the meaning of the Scriptures either by taking something away or adding or changing, whatever their faithlessness has commanded…(Commentary on 2 Pet. 3:16)

You who perceive the true God, in whom you have eternal life, keep yourselves from the teachings of heretics which lead to everlasting death, because like those who fabricate idols in place of God, they by their wicked teachings change the glory of the imperishable God into the likeness of perishable things. (Rom. 1:23) (Commentary on 1 Jn. 5:21)

St. John Damascene ca. 676-749

With all our strength, therefore, let us beware lest we receive communion from or grant it to heretics; Give not that which is holy unto the dogs, saith the Lord, neither cast ye your pearls before swine(Mat. 7:6), lest we become partakers in their dishonour and condemnation. For if trojan is in truth with Christ and with one another, we are assuredly voluntarily united also with all those who partake with us. For this union is effected voluntarily and not against our inclination. For we are all one body because we partake of the one bread, as the divine Apostle says. (1 Cor. 10:17) (Exact Exposition of the Orthodox Faith Bk. 4, 13)

St. Symeon the New Theologian ca. 949-1022

It is heresy when someone turns aside in any way from the dogmas that have been defined concerning the right faith. (Discourses XXXII. 2)

St. Theodosius of the Kiev Caves ca. 1009-1074

My son, it is not meet to praise another’s faith. Whoever praises an alien faith is like a detractor of his own Orthodox Faith. If anyone should praise his own and another’s faith, then he is a man of dual faith and is close to heresy. If anyone should say to you: “your faith and our faith is from God”, you, my son, should reply: “Heretic! do you consider God to be of two faiths? Don’t you hear what the Scriptures say: “One Lord, one Faith, one Baptism.” (Eph. 4,5) (Testament to the Great Prince

Izyaslav of Kiev)

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