Pelagianism

Put another way: imagine an athlete told he can run a marathon with no water, no training received, no coach — by the sheer energy of his legs, because “nature made him well”. Pelagianism applies this reasoning to salvation: God created us capable, He gave us the law as the course map and Christ as the model runner — the rest depends only on us. The image seduces; it empties the Cross of its necessity^[4].

Man is born intact: the will suffices

First thesis, the matrix of all the others: the human will was not wounded by Adam's fault. Every man is born in the exact state of Adam before his fall, with entire freedom and a natural capacity sufficient to keep all the commandments. Adam's sin harmed Adam alone; it transmitted nothing to his descendants — neither guilt, nor wound, nor weakened inclination^[5].

The consequence follows inexorably: since a divine commandment could not demand the impossible — God would not command what man cannot accomplish — man can in principle avoid all sin, live an entire life without fault, and several righteous men before Christ are even said to have done so^[6].

“Whenever I have to speak of moral instruction and the conduct of a holy life, I am accustomed first to show the strength and quality of human nature, and to make plain what it is capable of accomplishing.” — Pelagius, Letter to Demetrias, ch. 2^[7]

Grace reduced to an outward help

Second thesis: grace exists, but only as an outward aid. Pelagius and his disciples acknowledge three gifts of God: nature itself (free will created good), the law and doctrine that enlighten the mind, and the forgiveness of past sins joined to the example of Christ that stimulates the will. What Catholic doctrine calls interior grace — the present help by which God touches the heart, inspires good will and gives the strength to accomplish the good — is denied as necessary: man can will and accomplish salutary good by his natural strength alone^[8].

In his De libero arbitrio (416), Pelagius conceded, through barely parted lips, a sort of interior grace — an illumination of the mind through sermons and the reading of the Bible — but specifying that it served only to facilitate the accomplishment of the good, not to make it possible^[9]. The nuance is the whole debate: for the Church, without grace, salutary good is not merely more difficult, but absolutely impossible — this is canon 5 of Carthage (418)^[10].

Original sin denied or emptied of meaning

Third thesis, the sharpest, formulated by Caelestius: there is no sin transmitted by generation. Adam, he claimed, was created mortal — he would have died even without sinning. Newborn children are in the same state as Adam before his fall. The death of all men does not come from Adam's sin, any more than the resurrection of all comes from Christ — each destiny is decided individually^[11].

Caelestius, summoned at Carthage (411) to retract, answered that the inheritance of Adam's sin was an open question, a matter of free opinion in which denial was not heresy^[12]. The synod did not follow him: his six theses were condemned, and the priestly ordination he sought was refused him^[13].

On the baptism of infants, the Pelagians were divided: all admitted that infants must be baptized “with the same formula as adults”, but not to wash away any real original guilt — only to open their entrance into the kingdom of God. Children dying without baptism would be excluded from the kingdom, but not from eternal life: an unprecedented distinction, with no foundation in Tradition, creating two posthumous destinies where the Church knows only one^[14].

“God commands, therefore man can”: the argument that seduced Rome

Fourth thesis, the apologetic nerve of the system: God is just; He would not command what man cannot accomplish; therefore man can accomplish all that is commanded of him. The argument, seemingly irrefutable, made Pelagius' success in the ascetic circles of the Roman aristocracy: it flattered moral exactingness and cleared God of all responsibility for evil^[15].

Saint Augustine turned the argument back by showing what it presupposes: that man's present nature is identical to created nature. Yet that is precisely what Revelation denies — man is wounded, and that is why he needs a Saviour, not a mere model. To command does not imply that the subject can obey alone: a physician orders a paralytic to walk, not because the patient can, but to reveal to him that he needs to be healed^[16].

The full account of Pelagius' life and of the trial in seven acts is found in the article Pelagius: only the doctrinal skeleton is kept here — who formulated what, and where the idea came from.

Pelagius the moralist; Caelestius the systematizer

Pelagius (c. 354–after 418), a lay monk from the British Isles settled at Rome since the pontificate of Anastasius I (398-401), was not first a theoretician: he was an ascetic director preaching moral exactingness to the Christian elite. His practical maxims — you can live a holy life, your nature is capable of it — seduced; they remained ambiguous, and Pelagius always knew, before tribunals, how to phrase them in acceptable terms^[17].

It was his disciple Caelestius, a Roman lawyer converted to monastic life, who turned these maxims into sharp-edged theories, notably on original sin explicitly denied. A capital and often blurred fact: it was Caelestius, not Pelagius, who was condemned by name first — the master preached an ambiguous exactingness, the disciple drew its radical dogmatic consequences^[18].

The six theses condemned at Carthage (411)

When Caelestius, arriving at Carthage in 411, sought priestly ordination, the deacon Paulinus of Milan lodged against him a memorandum listing six propositions — perhaps drawn literally from his lost work Against the Transmission of Sin — as heretical. Here they are, in substance^[19]:

Caelestius refused to retract, appealed to the pope without following through, and left for Ephesus where he had himself ordained priest: the African condemnation would follow him as far as the East^[20].

Julian of Eclanum, the dialectician who took up the torch

After 418, Pelagianism found a leader of a different stamp from the moralist Pelagius: Julian, bishop of Eclanum in Apulia, one of the eighteen Italian bishops who refused to sign Zosimus' Tractoria. Learned, philosophical, a redoubtable dialectician, he shifted the debate: it is no longer the will he exalts, but the goodness of created nature — marriage, concupiscence, the flesh — against the Augustine he accuses of Manichaeism, of despising creation under colour of defending it^[21].

Taking refuge in Cilicia with Theodore of Mopsuestia, he wrote his great works (Against Turbantius in 4 books, then To Florus in 8 books), to which Augustine answered until his death (Against Julian in 6 books, then the Unfinished Work left incomplete)^[22]. His attempt to recover his see in 439, feigning repentance, was courageously foiled by Pope Saint Sixtus III^[23].

The Greek root: Theodore of Mopsuestia

The error was not born of nothing. In the East, where freedom was strongly stressed against ambient fatalism and where the doctrine of grace remained vague, some Greeks accentuated the penalty of original sin more than the guilt — and Theodore of Mopsuestia went so far as to deny original guilt and the penal character of bodily death^[24]. Pelagius, a Hellenist formed through contact with the Greeks, absorbed this one-sidedness without realizing it. Theodore moreover welcomed Julian in exile in Cilicia — and his memory was condemned with the Three Chapters at the Council of Constantinople II (553)^[25].

Around 405, at Rome, Augustine's Confessions were being read at a gathering attended by Pelagius. When they reached the passage where the bishop of Hippo prays: “Give what You command, and command what You will” (Da quod iubes et iube quod vis), Pelagius, in the presence of a bishop, could not bear it: he flared up and almost quarrelled with the one who had quoted the sentence^[26].

“Give what You command, and command what You will.” — Saint Augustine, Confessions, X, 29^[27]

The whole dispute lies in that anger: if God must give what He commands, then man does not possess it by nature — and the entire Pelagian system collapses. Augustine himself would recall the incident more than twenty years later, in the De dono perseverantiae (428-429): his Roman words, written before the heresy even existed, already contained the whole refutation^[28].

The detailed account — persons, twists, procedural documents — belongs to the article Pelagius. Only the doctrinal value of each stage is kept here: what each judgment fixed for the faith.

Two doctrinal lessons emerge. First, the Diospolis affair: a tribunal can acquit a heretic when the accused hides his thought under pious formulas — the acquittal of 415 never proved Pelagius' orthodoxy, only his skill^[29]. Second, the Zosimus episode: the pope, from a sense of justice, refused to strike before full conviction — and when the Africans required the explicit confession of interior grace for every salutary thought, word and work, he decided with his Tractoria, quoting abundantly the very works of the accused^[30].

On 1 May 418, in the basilica of Faustus at Carthage, about two hundred bishops under the presidency of Aurelius promulgated the canons which, with the exception of the last, became obligatory articles of faith for the universal Church (Denzinger-Hünermann 101-108)^[31]. Some manuscripts join to them a ninth canon, against any “intermediate place” for children dying without baptism^[32].

Each of the first three groups strikes at one pillar of the system: canons 1-2 bring down the denial of original sin, canons 3-5 outward grace, canons 6-8 claimed impeccability — taking as touchstone the very prayer of the Church: if the saints themselves ask forgiveness in truth, no one is without sin, and all need the Saviour^[33].

Against Donatism, Augustine had defended the unity of the Church; against Pelagius, he forged what earned him the title of Doctor gratiae. His anti-Pelagian treatises stretch from 412 to 430 — some twenty works, whose principal ones still form the Catholic arsenal^[34]:

Scripture against Pelagius: the Pauline dossier

Augustine does not reason in a vacuum: he lines up the texts the Pelagians could never explain away.

“By one man, sin entered the world” (Rom 5:12). The Adam-Christ parallel structures the whole epistle: as all die in Adam, all live again in Christ. If death is not transmitted, resurrection is not transmitted either — and infant baptism becomes an empty rite^[35].

“What have you that you did not receive?” (1 Cor 4:7). The question strikes down the central thesis: if good will came from nature alone, man would possess by himself what he in reality received. Every excellent gift comes down from above — including the willing itself^[36].

“Without Me, you can do nothing” (Jn 15:5) and “God works in you both to will and to do” (Phil 2:13). Not: without Me, you will do it with more difficulty — but: you can do nothing. And it is not only action that God works, it is the willing itself^[37].

The cry of infants and the prayer of the saints

Two proofs from facts, stronger than syllogisms. First, the baptism of infants: the universal Church baptizes newborns who have committed no personal sin. If there were nothing to remit, the rite would be a sham — and the entire Church would have been mistaken since the apostles^[38].

Augustine turns the question back on the Pelagians: let them explain why infants are baptized, if they have nothing to be forgiven^[39].

Then the Our Father: the Church makes all say, saints included, “forgive us our trespasses”. If the perfect could live without sin, the saints would lie in praying — every day, at every Mass. Canons 6 to 8 of Carthage seal this argument: the saints speak in truth^[40].

Against Julian: defending nature without denying the wound

Julian accused Augustine of Manichaeism: making evil a substance, despising marriage and the flesh. The answer, notably in On Marriage and Concupiscence, distinguishes what Julian confuses: marriage is good as a divine institution, fruitfulness is good, the body is good — but the concupiscence that disorders the use of these goods is the transmitted wound, which grace heals without destroying nature^[41].

The answer holds in one formula: human nature, created good by the good God, was vitiated by sin; sick, it needs a physician^[42].

The Catechism repeats Carthage word for word

Fourteen centuries later, the Catechism of the Catholic Church has taken nothing away from the eight canons: man is born with a wounded nature deprived of original holiness (CCC 402-405); the baptism of infants washes away a really transmitted fault (CCC 403, 405); justification comes from God's grace, and man can do nothing without it for his salvation (CCC 1996-2011)^[43]. The positive developments belong to the neighbouring articles — original sin, actual grace, sanctifying grace — but the backbone is unchanged since 1 May 418^[44].

Trent: the double lock (1546-1547)

Facing the Reformation, the Council of Trent tightened the double lock. Session V (1546), by its decree on original sin, defined transmission by propagation and the necessity of infant baptism — Carthage canonized for the modern age^[45]. Session VI (1547), by its decree on justification, strikes with anathema, from its very first canon, whoever claims that man can be justified by his own works, accomplished by his natural strength or by the doctrine of the law, without divine grace through Jesus Christ^[46]. It is Caelestius' thesis no. 5 — the Law suffices — condemned a second time, eleven hundred and thirty years later^[47].

Orange (529): the complement, not the duplication

After Ephesus, full-blooded Pelagianism still smouldered in Gaul and Britain. The remaining question — does the very first movement toward God come from man alone, with grace coming afterwards to assist? — belonged to a softened doctrine that history named semi-Pelagianism: it was settled by the Second Council of Orange (529), which affirmed that even the beginning of faith is a gift of prevenient grace^[48]. The whole dossier — John Cassian, Faustus of Riez, Saint Prosper of Aquitaine, the 25 canons of Orange — belongs to the article semi-Pelagianism: it is not duplicated here^[49].

The last ancient hearths: Gaul, Britain, Ireland

Condemned in East as in West, Pelagianism smouldered rather than died. Its centres were Gaul and Britain: around 429, a synod probably held at Troyes had to act severely against the Pelagians and sent Saint Germanus of Auxerre and Saint Lupus of Troyes to fight the heresy across the Channel, where it enjoyed the support of two disciples of Pelagius, Agricola and Fastidius^[50]. Nearly a century later, Wales was still its hearth: Saint David of Menevia took part in 519 in the synod of Brefi directed against the local Pelagians^[51]. In Ireland, Pelagius' Commentary on Saint Paul long remained in use, as numerous insular citations attest^[52]. Even at Rome, around 440, the Liber Praedestinatus still bears the mark of authentic Pelagianism^[53].

The permanent temptation: saving oneself

But the history of the hearths matters less than the lesson: Pelagianism is the permanent temptation of Christianity — believing that man saves himself by his own strength, that holiness is a record of efforts, that grace is mere decoration. Each age dresses it in its own fashion: morality without a Saviour, techniques of perfection, Christianity reduced to ethics^[54].

Pope Francis, in Gaudete et Exsultate (2018), gave this resurgence its official name: “present-day Pelagianism” (§§ 47-62). The power the Gnostics attributed to the intellect, some now attribute to the human will and to personal effort: they forget that “it is not a matter of man willing or running, but of God showing mercy” (Rom 9:16)^[55].

Those who embrace this Pelagian or semi-Pelagian mentality, although they speak of God's grace in watered-down discourses, “ultimately trust only in their own strength and feel superior to others because they observe certain rules or because they remain unfailingly faithful to a certain Catholic style”. — Pope Francis, Gaudete et Exsultate, § 49^[56]

“May the Lord deliver the Church from the new forms of Gnosticism and Pelagianism that weigh her down and hold her back on the path to holiness!” — Pope Francis, Gaudete et Exsultate, § 62^[57]

• Pelagius — the life of the founder and the detailed account of the trial in seven acts
• Semi-Pelagianism — Cassian, Faustus of Riez, Prosper of Aquitaine and the Council of Orange (529)
• Saint Augustine of Hippo — the Doctor gratiae and his combat against the two great African heresies
• Donatism (311-411) — Augustine's other controversy: the unity of the Church and the validity of the sacraments
• What is actual grace? — the positive doctrine of interior help
• The heresies of the early centuries — the panorama: from Gnosticism to Docetism, from Marcionism to Arianism
• Joseph Pohle, Catholic Encyclopedia (1913), Pelagius and Pelagianism — full text on newadvent.org
• Saint Augustine, anti-Pelagian treatises — Patrologia Latina, vols. 44-45
• Pope Francis, Gaudete et Exsultate (19 March 2018), §§ 47-62 — vatican.va
• Hefele, History of the Councils, vol. II — the reference conciliar narrative (Carthage, Diospolis, Ephesus)