Heresies in the Catholic Church
In Christianity, the word heresy, from the Greek haíresis (choice, school of thought), designates a doctrine or interpretation that departs from the faith recognized as authentic by the Church. Over the centuries, a number of currents, often born of a sincere search for truth, have been declared as heretical when they jeopardized the unity of the faith or the understanding of the mystery of Christ. In the Catechism of the Catholic Church, heresy is defined as "the obstinate denial, after the reception of Baptism, of a truth which must be believed by all, a truth which must be believed of divine and Catholic faith, or obstinate doubt concerning this truth" (§ 2089 of the Catechism of the Catholic Church). In other words, a doctrine or opinion contrary to the official teaching of the Catholic Church. Anyone who supports a heresy is called a heretic. The Code of Canon Law provides for sanctions such as automatic excommunication for heresy (Can. 1364). In this article, find out about the main heresies in the history of the Catholic Church and how to prevent them today.
Heresies concerning Jesus Christ
Discover below the main heresies concerning Jesus Christ, known as Christological heresies.
Gnosticism
Gnosticism, which arose in the first centuries of Christianity, is one of the oldest heresies. It was based on the idea that salvation did not come from faith or works, but from gnosis, a secret knowledge reserved for a few initiates. According to this vision, the material world, the work of an inferior demiurge, was evil; only the soul, a divine spark trapped in the flesh, aspired to rediscover the light of the true God, unknown and distant. This dualistic cosmology, in which spirit and matter, light and darkness, are opposed, appealed to a number of absolutist minds, but was rejected as early as the 2nd century by the Church Fathers, notably Irenaeus of Lyon and Tertullian, who affirmed the goodness of creation and the reality of theincarnation. Gnosticism appears as the symbol of a misguided mystical quest, where the desire to know God ends up separating man from Him.
Marcionism
Marcionism, born in the 2nd century around Marcion of Sinope, preached a radical break between the God of theOld Testament and the God of the Gospel. The former, a harsh judge and creator of the material world, was for him an inferior demiurge; the latter, the God of mercy revealed through Christ, embodied pure love and deliverance. Marcion therefore rejected the entire Old Testament and composed his own canon, reduced to a pared-down Gospel of Luke and a few of Paul's letters. Around 144, the Church in Rome solemnly condemned his doctrine, seeing in this separation a mortal danger for the faith. It then reaffirmed the unity of God, the continuity of revelation and the spiritual value of the Old Testament. By opposing justice and mercy, law and grace, Marcionism still raises the pressing question of how to reconcile the rigor of the Creator God with the infinite tenderness of the Savior God.
Arianism
Born in the early 4th century under the impetus of the priest Arius of Alexandria, Arianism is one of the most serious heresies in Christian history. It taught that the Son, though exalted above all creatures, was not God in the same sense as the Father: created before time, he would have had a beginning and would therefore not be eternal. This doctrine threatened the very heart of Christianity: if Christ was not God, how could he save man? Faced with the seriousness of the problem, Emperor Constantine convened the Council of Nicaea in 325, where over three hundred bishops proclaimed the consubstantiality of the Son with the Father: homoousios tō Patri, "of the same nature as the Father". The Council of Nicaea then affirmed that the Son was "begotten, not created", sealing the rejection of Arianism, confirmed by the Council of Constantinople in 381, which extended the confession to the Holy Spirit, meaning that the Son was "begotten, not created". the Holy Spirit, meaning that it added to the Creed, already formulated at Nicaea, a clause explicitly recognizing the divinity and place of the Holy Spirit within the Trinity. Arianism gradually died out, leaving the Church with the light of the central mystery of the Trinity.
To quote from the Catechism of the Catholic Church (§465):
"The First Ecumenical Council of Nicaea (...) condemned Arius for asserting that "the Son of God came out of nothing" and that he was "of a different substance from the Father."
Apollinarianism
Apollinarianism, born in the second half of the 4th century, owes its name to Apollinaris of Laodicea, a learned bishop and faithful disciple ofAthanasius of Alexandria. Eager to defend Christ's divinity against Arianism, he nevertheless went too far in denying the fullness of his humanity. According to him, the divine Word had taken on a body, but not a reasonable soul: thus, Christ would not have been fully man, but flesh animated directly by divinity. Apollinaris' intention was to preserve the unity of Christ, but his doctrine threatened the mystery of the Incarnation, for what is not assumed cannot be saved, according to the formula of Saint Gregory of Nazianzus.
The Church solemnly condemned Apollinarianism, first at the Council of Alexandria in 362, then above all at the Council of Constantinople in 381, where the full humanity of Christ was reaffirmed: spirit, soul and body united without confusion to the divine nature in one and the same person. This decision sealed faith in a Savior who was both true God and true man, capable of uplifting all human nature through the power of his divinity and the truth of his humanity.
Nestorianism
Nestorianism, which emerged in the early 5th century, took shape under the influence of Nestorius, Patriarch of Constantinople. Anxious to preserve the distinction between Christ's divine and human natures, he came to separate them to excess, speaking of two morally united persons rather than one truly divine and human person. From then on, he refused to call the Virgin Mary Theotokos, "Mother of God", believing that she had only given birth to the man Jesus, not the eternal Word. This division of Christ scandalized the faithful and deeply disturbed the unity of the faith. The Church reacted vigorously: the Council of Ephesus, meeting in 431 under the authority of St Cyril of Alexandria, condemned Nestorianism and proclaimed that Christ is one person in two natures, and that Mary can truly be said to be the Mother of God, since she bore the incarnate Word in her flesh.
It should be noted, however, that part of the Nestorian tradition continues to this day in the Assyrian Church of the East, which has retained the distinction between the two natures of Christ. This Church, historically centered in Mesopotamia and extending as far as India and China, considers itself faithful to this interpretation of the Incarnation, and is therefore distinct from that adopted by the universal Church.
To quote from the Catechism of the Catholic Church (§466):
"Christ's humanity has no other subject than the divine person of the Son of God, who assumed it and made it his own from the moment of his conception. For this reason, the Council of Ephesus proclaimed in 431 that Mary had truly become the Mother of God through the human conception of the Son of God in her womb".
Monophysism
Monophysism - whose name comes from the Greek monê physis, "one nature" - appeared in the 5th century as an excessive reaction against Nestorianism. Its proponents, following in the footsteps of Archimandrite Eutyches, asserted that, after the Incarnation, Christ's human nature had, as it were, merged into the divine nature, forming a single, essentially divine nature. Thus, Christ would have been only apparently man, and his humanity, absorbed by the divinity, would have lost all reality of its own.
The Church condemned this doctrine at the Council of Chalcedon in 451, the fourth ecumenical council, which proclaimed faith "in one and the same Christ, Son, Lord, only begotten, recognized in two natures, without confusion, without change, without division, without separation". With this formula of balance, the Church affirms the central truth of the Incarnation: Christ is both fully God and fully man, united in one person for the salvation of the world.
To quote from the Catechism of the Catholic Church (§467):
"One and the same Christ, Lord, only Son, whom we must recognize in two natures, without confusion, without change, without division, without separation. The difference between the natures is in no way eliminated by their union, but rather the properties of each are safeguarded and reunited in a single person and a single hypostasis."
Heresies linked to grace and salvation
Manichaeism
Manichaeism, born in the 3rd century at the instigation of the Persian prophet Mani, proposed a worldview based on absolute dualism. According to this doctrine, the universe was the scene of an eternal struggle between two equal and opposing principles: Light, the source of Good, and Darkness, the principle of Evil. The human soul, a spark of light captive in matter, had to purify itself in order to return to the spiritual realm. This system, nourished by Christian, Zoroastrian and Gnostic influences, appealed to many minds in search of purity, including the young Saint Augustine before his conversion. The Church condemned Manichaeism as early as the 4th century, notably at the Council of Arles in 314, affirming against it the goodness of creation and the uniqueness of the Creator God. This heresy, with its demand for absolute purity, highlights a permanent danger: denying the role of the body in man's salvation and rejecting the mystery of the incarnation.
Pelagianism
Pelagianism, born in the early 5th century around the British monk Pelagius, advocated an exalted vision of human freedom. Rejecting the idea of original sin, Pelagius asserted that man could, by his will alone and through imitation of Christ, attain moral perfection and salvation. For him, divine grace was merely an external help, not an inner force transforming the soul. This doctrine was appealing for its optimism, but it reduced redemption to a human effort, denying the necessity of redemptive grace. The Church reacted with firmness: the Council of Carthage in 418, supported by St. Augustine, condemned Pelagianism and proclaimed that grace is absolutely indispensable to salvation, for it is God alone who, through his love, heals man's wounded freedom.
Semi-Pelagianism, which emerged shortly afterwards in Provence, attempted to reconcile these extreme positions. Its proponents, such as John Cassian, recognized grace, but asserted that the first movement towards God could come from the human will. This apparently moderate nuance remained incompatible with the Augustinian doctrine of the primacy of grace. The Council of Orange in 529, under the influence of St. Caesarius of Arles, in turn condemned semi-Pelagianism and reaffirmed that every conversion, every spiritual good, proceeds first and foremost from the free gift of God. Thus was sealed the Church's faith in prevenient grace, the source and origin of all salvation.
Here's an extract from the CCC, §1998: The gift of grace "surpasses the capacities of the intellect and the powers of the human will".
And also, in Gaudete et exsultate, Pope Francis ' apostolic exhortation on the call to holiness in today's world: "We are said to be 'justified gratuitously' because nothing that precedes justification, whether faith or works, merits this grace of justification. Indeed, if it is grace, it does not come from works; otherwise, grace is no longer grace".
Catharism
Catharism, born between the 11th and 13th centuries in the south of France, especially in Languedoc, proposed a profoundly dualistic worldview. Heir to Manichaeism, it opposed the God of Good, pure spirit, to the God of Evil, creator of the material world. Flesh, birth and death were seen as the work of Evil, and salvation consisted in freeing the soul from its bodily prison through a life of asceticism and renunciation. The Perfecti, the spiritual elite of the movement, preached poverty, chastity, and refusal of the sacraments of the Church, judged corrupt and worldly. The Church solemnly condemned Catharism at the Council of Lateran III in 1179, then at the Council of Lateran IV in 1215, and launched the crusade against the Albigensians to eradicate it. All that remains of this heresy, which combined spiritual fervor and rejection of the world, is a memory of a tragic thirst for purity, burning to the point of delusion.
Vaudism
Vaudism, born in Lyon around 1170, has its origins in the shocking conversion of Pierre Valdo, a wealthy merchant who renounced his wealth to live according to the Gospel in the manner of the apostles. Surrounded by disciples called the Poor of Lyon, he preached radical poverty much like St. Francis of Assisi, evangelical simplicity and the direct proclamation of the Word of God, translated into the vernacular. This movement, initially driven by a profound surge of faith, soon came into conflict with ecclesiastical authority, unlike the Franciscans, as its members preached without mandate and challenged the wealth of the clergy. The Church condemned Vaudism at the Council of Lateran III in 1179, then again at the Council of Verona in 1184, declaring it heretical. Despite being hunted down, the disciples of Vaudism persisted, foreshadowing some of the ideas behind the Reformation. Their history bears witness to an ardent desire for fidelity to the Gospel, but a wounded fidelity, cut off from ecclesial communion.
Jansenism
Jansenism, which emerged in the 17th century, has its origins in the thought of the Flemish theologian Cornelius Jansen, bishop of Ypres, whose work Augustinus (published in 1640) developed a rigorist vision of grace and predestination. The Jansenists insisted on the corruption of the human heart by original sin, and on the need for an irresistible divine grace to attain it. They denounced what they saw as the moral and theological laxity of the Jesuits. This doctrine, which gave rise to intense debate about human freedom and God's mercy, was repeatedly condemned by Rome, notably in the bull Cum occasione in 1653, and in the Apostolic Constitution "Unigenitus Dei filius" (the only Son begotten by God). It was closely monitored by the Church until the 18th century. Jansenism, a blend of moral austerity and profound spirituality, left a lasting imprint on French religiosity, inspiring movements of interior piety and the quest for demanding holiness.
Heresies today
Although there is no such thing as a contemporary heresy, forms of New Age spirituality can be seen as modern heresies, insofar as they combine elements from a wide variety of traditions in a syncretism that is sometimes confused and profoundly distant from Christian doctrine. Among these practices, reincarnation, belief in the law of attraction, spiritual ecology, and relying on shamanism or spiritual guides, reveal an approach in which salvation and happiness seem to depend on human orcosmic forces rather than divine grace. Additional examples include relativism, which reduces all truth to subjective perception, and rationalism, which tends to subordinate knowledge to human reason alone. More subtly, personal development can also be part of this dynamic when it places man at the center of his own redemption (rather like Pelagianism) and transforms the spiritual quest into a mere technique for individual fulfillment. Historical heresies such as Gnosticism and Manichaeism find a certain echo in these modern practices, through the valorization of a secret knowledge or a cosmic struggle between opposing forces. These trends, seductive in their promise of mastery and fulfillment, nevertheless remind us of the need to distinguish the light of authentic faith from the deceptive flashes of a worldly, cobbled-together spirituality.
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