Letter 28: Having read your letter, beloved, at the late arrival of which we are surprised , and having perused the detailed account of the bishops' acts , we have at last found out what the scandal was which had arisen among you against the purity of the Faith: and what before seemed concealed has now been unlocked and laid open to our view: from which it...

Pope Leo the GreatFlavian, of Constantinople|c. 443 AD|leo great
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Barbarian peoples/invasions; Theological controversy; Travel & mobility

Letter 28: The Tome of Leo. To Flavian, Bishop of Constantinople.

I. Eutyches has been driven into his error by presumption and ignorance

Having read your letter, beloved -- and we are surprised it arrived so late -- and having examined the detailed record of the bishops' proceedings, we have at last discovered what scandal has arisen among you against the purity of the faith. What before seemed hidden has now been unlocked and laid open to our view. From this it is clear that Eutyches, who once seemed deserving of all respect by virtue of his priestly office, is in fact profoundly reckless and staggeringly ignorant -- so much so that the prophet's words apply to him: "He refused to understand, so as to do good; he plots wickedness on his bed" (Psalm 36:3-4).

Into this folly fall those who, encountering some difficulty in understanding the truth, turn for guidance not to the prophets' words, not to the Apostles' letters, not to the authority of the Gospels, but to themselves alone. They become masters of error precisely because they were never students of truth. What knowledge of the Old and New Testaments has this man acquired, when he has not even grasped the fundamentals of the Creed? What the whole world confesses in the words spoken by every person who is to be reborn in baptism has not yet penetrated the heart of this old man.

II. On the twofold birth and twofold nature of Christ

Not knowing, then, what he was obliged to believe concerning the Incarnation of the Word of God, and unwilling to seek the light of understanding through a careful study of the breadth of Holy Scripture, he should at least have listened attentively to that universal confession by which the whole body of the faithful declares its belief in God the Father Almighty, and in Jesus Christ, His only Son, our Lord, who was born of the Holy Spirit and the Virgin Mary. By these three statements alone, the schemes of nearly all heretics are overthrown.

For God is believed to be both Almighty and the Father, and the Son is shown to be co-eternal with Him, differing in nothing from the Father because He is God from God, Almighty from Almighty. Born of the Eternal One, He is co-eternal with Him -- not later in time, not lesser in power, not unlike in glory, not divided in essence. Yet this same eternally-begotten, only-begotten Son of the eternal Father was born in time of the Holy Spirit and the Virgin Mary. This birth in time took nothing from and added nothing to that divine and eternal birth, but spent itself entirely on the restoration of humanity, which had been deceived. Its purpose was to conquer death and, by its own power, to overthrow the devil who held the dominion of death (Hebrews 2:14).

For we could not have overcome the author of sin and death unless He whom sin could not defile and death could not hold had taken our nature and made it His own. He was conceived by the Holy Spirit within the womb of His Virgin Mother, who brought Him forth with her virginity intact, just as she had conceived Him with her virginity unimpaired.

III. The union of the two natures in Christ

The distinctive character of each nature, therefore, being preserved and coming together in one Person, humility was assumed by majesty, weakness by power, mortality by the immortal. And in order to pay the debt of our fallen condition, an inviolable nature was united to a nature capable of suffering, so that -- as our healing required -- one and the same Mediator between God and humanity, the man Christ Jesus (1 Timothy 2:5), could both die in respect of the one nature and could not die in respect of the other.

Thus in the complete and perfect nature of true man, true God was born -- complete in what belongs to Him, complete in what belongs to us. By "what belongs to us," we mean what the Creator formed in us from the beginning and what He took upon Himself in order to restore. For there was no trace in the Savior of what the deceiver introduced and what humanity, once deceived, allowed to enter. He did not become a participant in our sins simply because He entered into fellowship with human weakness. He assumed the form of a servant without the stain of sin, enriching what is human without diminishing what is divine. For that self-emptying by which the Invisible made Himself visible, and the Creator and Lord of all things chose to be one among mortals, was a stooping down of compassion, not a loss of power. Accordingly, He who, remaining in the form of God, made man, was made man in the form of a servant. Each nature preserves its own character without defect, and just as the form of God does not do away with the form of the servant, so the form of the servant does not diminish the form of God.

IV. The practical consequences of this doctrine -- Christ's acts reveal both natures

It is the devil's boast that man, deceived by his cunning, was stripped of divine gifts and, laid bare of the endowment of immortality, fell under the harsh sentence of death. And the devil found some consolation for his own miseries in having a companion in transgression. God too, acting according to the demands of His justice, changed His former sentence concerning the man whom He had created in such great honor, so that the plan of His mercy might be accomplished through hidden mystery. Thus, without the devil's knowledge, the sin would not stand, and man, led by the craft of the devil's wickedness into guilt, would not perish contrary to the purposes of God.

The Son of God therefore enters these lowly conditions of the world, descending from His heavenly throne yet not departing from the Father's glory, begotten in a new order of things and by a new mode of birth. In a new order, because He who is invisible in what belongs to Himself was made visible in what belongs to us; the Incomprehensible willed to be comprehended; the One who exists before all time began to exist in time. The Lord of the universe took the form of a servant, veiling the immensity of His majesty. The God who cannot suffer deigned not to disdain becoming a man who can suffer, and the Immortal One submitted to the laws of death.

Born by a new mode of birth, because inviolate virginity, knowing no desire, supplied the material of His flesh. From His mother the Lord took nature, not sin. The servant's form which He wore does not detract from the divine and equal form; nor does it imply any deficiency in the divine nature. For the two natures were joined in one Person: in the human, the Man; in the divine, the eternal God. The proper activity of each nature remains unconfused and entire.

To be brief: the same Person who is true God is also true man, and in this union there is no deception. The lowliness of the man and the grandeur of the deity are perfectly reciprocal. Just as God is not changed by His compassion, so the man is not absorbed by the dignity. Each nature performs its proper functions in communion with the other: the Word accomplishing what belongs to the Word, the flesh carrying out what belongs to the flesh. The one blazes with miracles, the other submits to insults. And as the Word does not withdraw from equality with the Father's glory, so the flesh does not abandon the nature of our race.

For -- and this must be said again and again -- one and the same is truly Son of God and truly Son of Man. God, in that "in the beginning was the Word, and the Word was with God, and the Word was God" (John 1:1). Man, in that "the Word became flesh and dwelt among us" (John 1:14). God, in that "all things were made through Him, and without Him nothing was made" (John 1:3). Man, in that He was "born of a woman, born under the law" (Galatians 4:4). The birth of the flesh is a manifestation of human nature; the virgin birth is a sign of divine power. The infancy of the babe is shown by the lowliness of the cradle; the greatness of the Most High is declared by the voices of angels. Herod wickedly plots to kill one who is like a newly born child; yet the Magi rejoice to adore on bended knee one who is Lord of all.

When He came to be baptized by His forerunner John, lest it be hidden that the Godhead was veiled by the covering of flesh, the voice of the Father thundering from heaven declared: "This is My beloved Son, in whom I am well pleased" (Matthew 3:17). He whom the devil's craftiness tempts as a man, the angels serve as God. To hunger, to thirst, to be weary, to sleep -- these are evidently human. But to feed five thousand men with five loaves, to give living water to the Samaritan woman, to walk on the surface of the sea with feet that do not sink, to calm the swelling waves by rebuking the storm -- these are beyond doubt divine.

Therefore, just as -- to pass over many other instances -- it does not belong to the same nature to weep with compassion for a dead friend and then, by a word of command, to raise that friend from the dead after he had been four days in the grave; or to hang on the cross and yet, turning day into night, to make all the elements tremble; or to be pierced by nails and yet to open the gates of paradise to the faith of a thief -- so it does not belong to the same nature to say "I and the Father are one" (John 10:30) and to say "The Father is greater than I" (John 14:28). For although in the Lord Jesus Christ there is one Person of God and man, the source of the indignity that is shared by both is one thing, and the source of the glory that is shared by both is another. From us He has a humanity less than the Father; from the Father He has a divinity equal to the Father.

V. Conclusion

On account of this unity of Person, to be understood in both natures, we read that the Son of Man came down from heaven (John 3:13), although it was the Son of God who took flesh from the Virgin of whom He was born. And again, the Son of God is said to have been crucified and buried (1 Corinthians 2:8), although He suffered these things not in His divinity -- in which the Only-Begotten is co-eternal and consubstantial with the Father -- but in the weakness of human nature.

Therefore, in the Creed as well, we all confess that the Only-Begotten Son of God was crucified and buried, in accordance with the Apostle's words: "For if they had known, they would never have crucified the Lord of glory" (1 Corinthians 2:8). And when our Lord and Savior Himself was instructing His disciples' faith by questioning them, He said: "Who do people say that the Son of Man is?" (Matthew 16:13). And when they had given various answers, He said: "But who do you say that I am?" -- that is, I who am the Son of Man, and whom you see in the form of a servant and in the reality of flesh: who do you say that I am? Whereupon the blessed Peter, inspired by God and about to benefit all nations by his confession, said: "You are the Christ, the Son of the living God" (Matthew 16:16).

Rightly, therefore, was he declared blessed by the Lord, and drew from the original Rock that firmness both of name and of power, so that he who through the revelation of the Father confessed the same Person to be both the Son of God and the Christ should be called the Rock -- the foundation upon which the Church would be built, and against which the gates of hell would never prevail and which alone would hold the keys of the kingdom of heaven (Matthew 16:17-19).

Let Eutyches therefore turn from his dangerous delusion, the error which, as the record of the proceedings shows, he refused to abandon even when convicted. Let him not imagine that the body of Christ was anything other than the body born from the Virgin, or that the flesh was of a substance different from ours. If he cannot assent to the true faith as drawn from every page of Scripture, let him at least yield to the most plain and open declaration of the blessed Apostle Peter, who said: "Christ suffered for us in the flesh" (1 Peter 4:1), and let him listen to the blessed Apostle John proclaiming: "Every spirit that confesses that Jesus Christ has come in the flesh is from God, and every spirit that denies Jesus is not from God, and this is the spirit of the Antichrist" (1 John 4:2-3).

Read in the synod, October 10, 449 (at the Council of Chalcedon, 451).

Modern English rendering for readability. See the 19th-century translation or original Latin/Greek for scholarly use.

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