Eutychianism

Eutychianism is the teaching, named for the fifth-century Constantinopolitan presbyter Eutyches, that after the incarnation Jesus Christ had only one nature rather than two: his human nature was absorbed into the divine, rather than the two remaining distinct while united in one person.¹ It is a heresy that arose as an overcorrection against Nestorianism: where Nestorius divided Christ’s natures so far apart that they threatened to become two persons, Eutyches, in opposing him, collapsed the two natures into one.¹

Historical Origin

Eutyches was a presbyter of Constantinople and “one of the most strenuous advocates of the views of [Cyril of Alexandria] and an opponent of Nestorius” who became, in time, the namesake of the one-nature doctrine itself.¹ He was accused of heresy and condemned by Flavian, bishop of Constantinople, in a local council.² Eutyches appealed the sentence to Leo, bishop of Rome, who at that stage took his side: Calvin’s account records that Leo “inveighed bitterly against Flavianus, as having condemned an innocent man without due investigation,” so that “for some time the impiety of Eutyches was confirmed.”²

Eutyches’ condemnation at Constantinople “greatly incensed” Dioscurus, bishop of Alexandria, who used his influence to convene a general synod at Ephesus in 449. The opponents of Eutyches were forcibly excluded from that synod, Eutyches was restored to office, and his one-nature teaching was formally sanctioned. History has remembered the gathering as “the robber council.”³ The emperor Theodosius II sanctioned its decisions, but he died the following year; his successor, Marcian, was hostile to Dioscurus and summoned a new general council, which met at Chalcedon in 451.³

At Chalcedon, Dioscurus was deposed and a letter Leo had written to Flavian, known as Leo’s Tome, was adopted as “a true exposition of the faith of the Church.”³ The same Leo who had defended Eutyches against Flavian two years earlier now supplied the very letter the council used to condemn him. Framing its own confession on that basis, the council declared Christ “one and the same… existing in two natures without mixture, without change, without division, without separation,” with “the peculiar property of each nature being preserved” rather than destroyed by their union.³ A. A. Hodge places this verdict alongside the Council of Ephesus (431), which had condemned Nestorius for dividing Christ’s person, and the Council of Constantinople (681), which later condemned the Monothelites for denying Christ a fully human will: three councils “accepted by all Protestants” as together settling the church’s doctrine of Christ’s person from both directions, against dividing the natures and against confusing them.⁴

Core Tenets

Eutyches held that Christ possessed two natures before the incarnation but only one afterward. Hodge preserves his own formula in the original Greek and its sense: the Lord was “of two natures before the union,” but after the union he confessed “one nature.”¹ Contemporaries illustrated what that remaining nature amounted to with a chemical analogy: the human nature, on this view, was “exalted into the divine, or lost in it, as a drop of vinegar… in the ocean.”¹ Hodge draws out what such a dissolution would cost: “Christ ceased to be a man,” his human “earthly life became an illusion, or empty show,” and with it “his redeeming work, and his bond of union or sympathy with us.”¹

A 2024 doctoral dissertation on the Reformed scholastic Francis Turretin restates his case against Eutyches in similar terms: Eutyches, “laboring against Nestorius, confounded the two natures by making them one nature (hence monophysitism),” an error “the framers of the Chalcedonian Definition” answered directly with the phrase “without change and confusion.”⁵ On this reading, Scripture’s own case for two distinct, unconfused natures rests partly on Christ’s possessing two wills rather than one, as at Gethsemane, where he prayed, “not my will, but yours, be done” (Luke 22:42) even while remaining, as God, one in will with the Father.⁶

Confessional and Biblical Response

The 1689 Second London Baptist Confession does not name Eutyches, but its statement of Christ’s person rules the teaching out directly: Christ’s “two whole, perfect, and distinct natures were inseparably joined together in one person, without conversion, composition, or confusion.”⁷ A confession that insists the two natures stay “distinct” and free of “confusion” leaves no room for one nature to be dissolved into, or exalted into, the other.

Calvin states the underlying Reformed principle for why Chalcedon, and not the council that preceded it, is received: “we embrace the Council of Chalcedon, and repudiate the second of Ephesus, because the latter sanctioned the impiety of Eutyches, and the former condemned it. The judgment of these holy men was founded on the Scriptures.”⁸ A council’s decision carries weight only so far as it agrees with Scripture, and on Calvin’s account that is exactly what distinguishes Chalcedon’s verdict against Eutyches from the Robber Synod’s endorsement of him.

Elsewhere, arguing against a later Lutheran claim that Christ’s human body shares the divine attribute of omnipresence, Calvin traces the same root error back to Eutyches: “It is strange that they attend not to the cause of [Eutyches’] condemnation, viz. that destroying the distinction between the natures, and insisting only on the unity of person, he converted God into man and man into God.”⁹ Whatever the immediate target, Calvin treats confusing Christ’s two natures, in either direction, as the same underlying mistake Eutyches made and the church already condemned.

Related Doctrines

References

Charles Hodge, “Chapter III. Person of Christ,” in Systematic Theology, Volume II (New York: Charles Scribner and Company, 1872), 401. ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶
John Calvin, Institutes of the Christian Religion, trans. Henry Beveridge (Edinburgh: Calvin Translation Society, 1845-1846), book 4, chap. 7, sec. 5, 370-371. ↩ ↩²
Hodge, Systematic Theology, Volume II, 402. ↩ ↩² ↩³ ↩⁴
Archibald Alexander Hodge, Outlines of Theology (New York: Robert Carter and Brothers, 1879), chap. 23, “Person of Christ,” 385-386. ↩
Alex Charles Tibbott, “Turretin, the Trinity, and the Incarnation,” in “De Impassibilitate Et Satisfactione: An Examination of the Methodological Implications of Trinitarian Classical Theism for the Doctrine of the Atonement” (PhD diss., The Southern Baptist Theological Seminary, 2024), 203, citing Francis Turretin, Institutes of Elenctic Theology 13.7.13. ↩
Tibbott, “Turretin, the Trinity, and the Incarnation,” 204. ↩
The Second London Baptist Confession of Faith (1689), chap. 8, “Of Christ the Mediator,” para. 2. ↩
Calvin, Institutes, book 4, chap. 9, sec. 9, 408. ↩
Calvin, Institutes, book 4, chap. 17, 586. ↩