
By the end of the first millennium, deification had become the principal way the Eastern Church would speak of God’s gift of salvation in Jesus Christ. The gospel promises many blessings—forgiveness of sins, deliverance from bondage, victory over death, baptism in the Spirit, eternal life in the Kingdom—but all these blessings would eventually be comprehended under one primary theme—theosis. To be saved is to be reborn into the life of the Father, through the Son, in the Holy Spirit. In Christ, we are given to participate in the one God and so made “partakers of the divine nature” (2 Peter 1:4). As St Athanasius the Apostolic would famously declare in the fourth century: “For God was made man that we might be made God” (On the Incarnation 54).
Yet it would take years of prayerful reflection upon the Scriptures and the Eucharist for preachers to reach such boldness. Given the Church’s struggle to speak the gospel in a pagan world filled with deities, such language would have been easily misunderstood. But the groundwork was laid in the late second century by the great theologian St Irenaeus of Lyons. In his writings we encounter the foundational Trinitarian grammar of theosis.1 Irenaeus did not, of course, use the word, but the reality it names permeates his theology. His vision unfolds within the divine economy (οἰκονομία)—the “single, unified purpose or plan which God has for the whole of his creation.”2 This economy begins with God’s creation of the cosmos and his fashioning of the human being in the divine image, continues with the embodiment of the divine Word in the womb of Mary, and culminates in the glorification of the flesh and the eschatological renewal of all things. Irenaeus thus provides a narrative of deification centered in the Incarnation: “The Word of God, our Lord Jesus Christ, through his immeasurable love, became what we are, that he might bring us to be even what he is himself” (Against Heresies V pref.).
The End Reveals the Beginning
When we read a story, we start on the first page and continue until we reach the last. But when we read the biblical story, Irenaeus tells us, we must first jump to its conclusion. Only then can we understand what God intended when he created Adam. The creation of humanity and its eschatological consummation belong to a single divine economy whose meaning is disclosed in the glorification of Jesus Christ. The cosmos is created from the eschaton, and the eschaton is inaugurated on the cross. The end reveals the beginning. Or as Irenaeus puts it: “the beginning appeared at the end” (AH 1.10.3). The crucified and risen Lord is the Alpha and the Omega. John Behr incisively observes:
Irenaeus is clear that the only perspective from which one can contemplate the economy of God, from its beginning to its conclusion, is from the end point, the apocalyptic opening of the Scriptures at the end of the ages in the light of the Cross of Christ.3
For Irenaeus, protology and eschatology are thoroughly, from beginning to end, Christocentric.4
This eschatological perspective governs Irenaeus’s understanding of God’s creation of humanity as presented in Gen 1:27 and Gen 2:7 (when read together, as did Irenaeus). Scripture teaches us that the first human being, Adam, is made in the divine image; yet it is Jesus, the Second Adam, who is the archetypal image. Although Adam precedes Jesus in the historical sequence, Jesus is prior in the economy. In his Incarnation, the true image becomes visible in the flesh originally fashioned in the Garden. Christ is the first true human being:
In former times it was said that man had been made according to the image of God, but it was not yet shown; for the Word was as yet invisible, according to whose image man had been made. Wherefore also he easily lost the similitude. When, however, the Word of God became flesh, he confirmed both these: for he both showed forth the image truly, since he became himself what his image was, and he re-established the similitude after a sure manner, by assimilating man to the invisible Father through means of the visible Word. (AH V.16.2)
Here we find the theological foundation for the economy of salvation. The Word through whom the Father created the world becomes human himself, thereby revealing both the perfection of the human being and the final destiny of mankind. Adam is the “type of the one to come” (Rom. 5:14); Jesus is the prototype. Irenaeus provocatively describes the necessity of the Incarnation in these words:
Because the Word, the Fashioner of all things, prefigured in him the future economy relating to the Son of God on behalf of the human race, God having predetermined the first, the animated human that is, so that he should be saved by the spiritual one; for, since the Saviour pre-exists, it was necessary that the one to be saved should also exist, so that the Saviour should not be without purpose. (AH III.22.3)
You might want to re-read the above passage, as it’s one of the most surprising in patristic literature. Scholars have long debated its meaning. Yet when we have grasped that Irenaeus is reflecting upon the single divine economy from the eschatological end to the protological beginning, it begins to make an odd kind of sense. Creation and salvation together belong to the one divine economy. Given that the crucified, risen, and returning Jesus Christ is the Savior of humanity, the divine Word has always been the Savior; therefore it was necessary for God to create human beings for him to save, “so that the Saviour should not be without purpose.” As Behr elaborates:
In Adam, the Word sketched out in advance what would be revealed and established in the Son of God, Christ himself. The description of Adam as a ‘type’ implies the prior existence of the one of whom he is a type. As such, the one who was to come exists before Adam; it was by him and for him that Adam came into existence, and, furthermore, as he exists as the Saviour, Adam came into existence to be saved by him. Thus, though only appearing at the end, this one is, nevertheless, the true beginning. 5
God’s salvific intention, therefore, reaches beyond the recovery of a lost paradise. Adam’s disobedience subjected humanity to the dominion of sin, corruption, and death: “As our race went down to death through a vanquished man, so we may ascend to life again through a victorious one” (AH V.21.1). This victory is accomplished through the cross: “By his passion the Lord has destroyed death, nullified error, destroyed corruption, overcome ignorance; he has manifested life, displayed the truth and given incorruption” (AH II.20.3). The telos of the divine economy is nothing less than the eschatological perfection of humanity, joyously lived in communion with the Father through the Son in the Spirit. Christ restores what was lost in Adam and accomplishes what Adam did not attain. Salvation is both restoration and fulfillment.
The Human Being: Created for Glory
“So from this earth, while it was still virgin,” Irenaeus reports, “God ‘took mud from the earth and fashioned man,’ the beginning of humankind” (Demonstration 32). The human being is the handiwork of the divine Artist, molded by his two hands, the Word and the Spirit. The work of salvation is continuous with the work of creation. At every step along the way, he remains intimately involved in the formation of humanity, patiently bringing it toward its intended perfection.
But what exactly was the mud creature’s original condition? Christian theology typically thinks of Adam as possessing a state of perfection that he subsequently lost through disobedience. Irenaeus tells a different story. Adam was created good yet immature. He had only begun his journey toward the fullness of human existence. He was, as Irenaeus describes him, a child who needed to grow:
It was necessary for man to be first created; and having been created, to grow; and having grown, to become mature; and having become mature, to multiply; and having multiplied, to grow strong; and having grown strong, to be glorified; and having been glorified, to see his Lord. (AH IV.38.3)
Irenaeus addresses the question of why God did not create humanity perfect from the beginning. His answer turns upon the distinction between the uncreated God and his creatures. God is eternally perfect; creatures receive their existence from him and must grow into the perfection for which they have been created. Irenaeus elaborates in this long passage:
If, then, anyone say, “What then? Was not God able to have made man perfect from the beginning?” let him know that, as far as God is concerned, inasmuch as He is always the same and ingenerate, all things are possible to Him. But those things made by Him, because they have a later beginning of creation, must for this reason be inferior to Him who created them. For it was not possible for things recently created to be uncreated; and since they are not uncreated, on this account do they fall short of the perfect. And since these things are of a more recent origin, so are they infantile; and since they are infantile, so are they unaccustomed to and unexercised in perfect discipline. For certainly it is in the power of a mother to give strong food to her infant, yet she does not do so, since the child is not yet able to receive stronger nourishment. So too, it was in the power of God Himself to grant perfection to man from the beginning; but the man, on the contrary, was unable to receive it, since he was still an infant. And for this reason our Lord, recapitulating all things in Himself, came unto us in these last times, not in such a manner as He Himself was able to come, but in such a manner as we were able to behold Him. He could have come to us in His ineffable glory, but we were not able to receive the greatness of that glory. Therefore, as if to infants, He who was the perfect bread of the Father offered Himself to us as milk, since His coming was in keeping with a man. This He did so that we, being nourished, as it were, from the breast of His flesh, and from such a course of nourishment becoming accustomed to eat and drink the Word of God, might be able to contain in ourselves Him who is the bread of immortality: the Spirit of the Father. (AH IV.38.1)
“Infant” here is a literal translation of the Latin word infans, but scholars suggest that the underlying Greek word is νήπιος (nēpios), i.e., infant or child. We need not, however, think that Irenaeus imagined Adam and Eve as literal infants. He never specifies an age for them, though there are indications he may have thought of them as prepubescent. Whatever their physical age, Irenaeus clearly regards them as immature in their spiritual and emotional condition. They lacked the capacity to receive the glory of God. The human being must learn to receive the divine gifts. Growth requires time, experience, obedience. But humanity’s perfection ultimately awaited the coming of Christ himself. M. C. Steenberg offers this interpretation of the immaturity of Adam and Eve:
The state of infancy of which Irenaeus is speaking seems, above all else, to be a state of want: the first man is a child because he “falls short of the perfect,” because he cannot receive perfection, because he cannot endure God’s greatness… This monumental gulf between Adam and God, a gulf founded here in Adam’s own being as newly created man, is not one of physical distance nor deprivation of grace, but the natural difference of being that exists between Creator and created. One is infinite, the other finite; the distinction between the two is of the highest order. It is this concept which grounds the notion of radical incompleteness that stands as a driving theme behind Irenaeus’ larger conception of humankind. There is almost no section of his corpus that does not resound with the idea that humanity, commencing in Adam, stands at the base of an ascent into the perfection for which it is destined, perilously far from its goal yet offered full guidance and support for the duration of the journey… This full humanity, the whole and complete man, is for Irenaeus unequivocally the person of Jesus Christ. It is He who is the true image of God into which humanity was created and in whom all other human persons may come to their own full maturity.6
Irenaeus therefore understands creation dynamically. The creature fashioned from mud is called to become a participant in divine life. Adam’s infancy is fitting because the human being was created for a perfection that lay ahead. The incarnate Christ reveals the fulfillment of the divine plan. In him we behold what it means to be fully human.
Recapitulation in Christ
The heart of Irenaeus’s soteriology is his doctrine of recapitulation. The Greek word anakephalaiōsis means summing up or gathering together under a head. Irenaeus draws upon St Paul’s declaration that God intends to sum up all things in Christ (Eph. 1:10). In becoming human, the eternal Word enters the history of humanity and gathers that history into himself. He retraces the path of Adam, confronting the temptations and disobedience that brought humanity into bondage. “God recapitulated in himself,” Irenaeus writes, “the ancient formation of man, that he might kill sin, deprive death of its power, and vivify the human being” (AH III.18.7). Herein lies our redemption—the healing and perfecting of the image in which we were originally made:
When he became incarnate, and was made human, he recapitulated in himself the long unfolding of human beings, furnishing us with salvation by way of a compendium, so that what we lost in Adam—to be according to the image and likeness of God—that we might recover in Christ Jesus. (AH III.18.1)
Recapitulation embraces the whole of Adamic existence. The eternal Son of God is born of a woman, grows from infancy to adulthood, experiences hunger in the wilderness, confronts the Devil and overcomes temptation, weeps at the death of Lazarus, struggles with the fear of death, and freely subjects himself to the agony of the cross, embracing the fate that all human beings must suffer.
By living a genuinely human life in obedience to the Father, Jesus heals the long history of disobedience that began with Adam. The contrast between Adam and Christ is especially apparent in the accounts of temptation. In his immaturity, Adam succumbs in the Garden of Eden to Satan’s deception and eats from the tree of knowledge. Jesus, confronted by the same adversary in the wilderness, answers Satan with the words of Scripture, the voice of his Father. And in the Garden of Gethsemane, he freely submits to the inevitable conclusion of his mission, “not as I will, but as thou wilt” (Matt 26:39). His obedience to the Father finds its supreme expression in his sacrificial death upon the cross, “redeeming us by his own blood” (AH V.14.3). As Irenaeus declares: “So, by means of the obedience by which he obeyed unto death, hanging upon the tree, he undid the old disobedience occasioned by the tree” (Dem. 34). The disobedience of the tree of Eden is redeemed through the obedience of the tree of glory.
Irenaeus also speaks of the recapitulation of Eve in the Blessed Virgin Mary, whose obedience reverses Eve’s disobedience:
And just as through a disobedient virgin man was struck and, falling, died, so also by means of a virgin, who obeyed the word of God, man, being revivified, received life. For the Lord came to seek back the lost sheep, and it was man who was lost; and, therefore, He did not become any other formation, but being born from her who was of the race of Adam, He maintained the likeness of the formation. For it was necessary for Adam to be recapitulated in Christ, that “mortality might be swallowed up in immortality”; and Eve in Mary, that a virgin, become an advocate for a virgin, might undo and destroy the virginal disobedience by virginal obedience. (Dem. 33)
Note Irenaeus’s strong wording: “For it was necessary for Adam to be recapitulated in Christ … and Eve in Mary.” Given the Father’s predetermination to save humanity through divine recapitulation, it was economically fitting and proper that Christ be born of the Virgin Mary, whose faithful assent at the Annunciation would undo the disobedience of the virgin Eve. Thus the Theotokos is included in her Son’s redeeming work.
Adoption as Sons by the Holy Spirit
The salvific goal of the Incarnate Son’s work of recapitulation is the elevation of human beings as adopted sons. “For it was for this end,” declares Irenaeus, “that the Word of God was made man, and He who was the Son of God became the Son of man, that man, having been taken into the Word, and receiving the adoption, might become the son of God” (AH III.18.1). It is precisely here that we see in Irenaeus the gospel taking on the form of theosis. In recapitulating fallen humanity in his sanctified life, Jesus establishes himself as the head of a new human race. By baptismal union with him, we are reborn in the Spirit and incorporated into his filial communion with his Father:
For it was incumbent upon the Mediator between God and humans, by his kinship to both, to bring both to friendship and concord, and to bring it about that God would take the human to himself and that the human would give itself to God. For in what way could we be partakers of the adoption of sons, unless we had received through the Son participation in himself, unless his Word had not entered into communion with us by becoming flesh? Therefore he also passed through every stage of life, restoring all to communion with God. (AH III.18.7)
In recapitulating humanity, the eternal Son brings Adam and his descendants into participation in his own Sonship and communion with his Father. Irenaeus quotes Psalm 82.1, “God stood in the congregation of the gods, He judges among the gods,” and then remarks: “He refers to the Father and the Son, and those who have received the adoption; but these are the Church” (AH 3.6.2).
Consider also what our adoptive sonship ultimately entails: participation in the uncreated attributes of incorruptibility and immortality:
For this the Word of God became man, and the Son of God [became] Son of man, that man, mingled with the Word and thus receiving adoption, might become a son of God. We could not receive imperishability and immortality unless we had been united to imperishability and immortality. And how could we have been united with imperishability and immortality unless imperishability and immortality had first been made what we are, so that what was perishable might be absorbed by imperishability and what was mortal by immortality “that we might receive adoption as sons” (Gal. 4:5)? (AH III.19.1)
Here, my friends, is deification! Because of the Incarnation of the eternal Son, humanity is now given to share in the divine life of the one God. “Deification moves from the image and likeness,” explains Eric Osborn, “by means of the trinitarian economy, to the vision of God which gives incorruptibility.”7
We have yet to consider the critical role of the Holy Spirit in our adoption as sons. In this passage Irenaeus describes the work of the Father, Son, and Holy Spirit in the deification of humanity:
For this reason the baptism of our regeneration takes place through these three articles, granting us regeneration unto God the Father through His Son by the Holy Spirit: for those who bear the Spirit of God are led to the Word, that is to the Son, while the Son presents them to the Father, and the Father furnishes incorruptibility. Thus, without the Spirit it is not possible to see the Word of God, and without the Son one is not able to approach the Father; for the knowledge of the Father is the Son, and knowledge of the Son of God is through the Holy Spirit. (Dem. 7)
The Spirit leads us to the Son; the Son presents us to the Father; and the Father crowns our adoption as sons with the gift of life everlasting. Irenaeus directly connects rebirth in the Spirit to our adoption as children of the Father:
Therefore Isaiah says,… “For the Spirit will come forth from me and it is I who made every breath” [Isa 57:16], properly setting the Spirit in God, who in the last days has spread it forth on the human race by adoption. (AH V.12.2)
Irenaeus draws a crucial distinction between the life bestowed in creation and the new life bestowed through adoption:
For the Father bears the creation and His own Word simultaneously, and the Word borne by the Father grants the Spirit to all as the Father wills. To some He gives after the manner of creation what is made; but to others [He gives] after the manner of adoption, that is, what is from God, namely generation. And thus one God the Father is declared, who is above all, and through all, and in all. The Father is indeed above all, and He is the Head of Christ; but the Word is through all things, and is Himself the Head of the Church; while the Spirit is in us all, and He is the living water, which the Lord grants to those who rightly believe in Him, and love Him, and who know that “there is one Father, who is above all, and through all, and in us all” [Eph. 4:6]. (AH V.18.2)
Our adoption is thus a new generation, a birth into the divine life that transcends our original creation. As Behr comments: “Those … who receive the adoption of sons in Christ receive life as the life-creating Spirit himself, vivifying them permanently ‘inside and out.’”8
Hence we must think dialectically. To be baptized by the Spirit into the ecclesial body of the risen Christ is to be adopted as children of the Father; to be united to the Son is to be reborn in the Spirit. The logic must be run both ways if we are to grasp Irenaeus’s Trinitarian grammar.
Conclusion
Osborn invites us to think of the single divine economy of humanity’s deification as unfolding in three seasons:9
- The first season is creation and God’s fashioning of the first human beings and their historical movement through the successive dispensations of Adam, Noah, and Abraham. This is a time of pedagogy as God accustoms human beings to his grace and presence, harmonizes them “to the symphony of salvation” (AH IV.14.2), and prepares them to receive his incarnate Son and the gift of the Spirit.
- The second season is the new covenant of God’s enfleshment as the Second Adam and his recapitulation of human history through death and resurrection. “The cosmic cross implanted (infixus) in creation becomes visible,” comments Osborn. “In his incarnation and death Christ has gathered up (in compendio) the whole history of salvation and restored the image and likeness of God in man.”10 This is the season of the Church, which “has been planted as a garden [paradisus] in this world” (AH V.20.2). In this garden, the faithful eat the words of Scripture and feast upon the Body and Blood of Christ, as they look forward to their final deification in the Kingdom.
- The third season will begin with the return of Christ in glory, when he shall raise the dead, judge the living and the dead, and consummate his work of recapitulation. The divine economy that began with the creation of Adam will reach its fulfillment in the resurrection of humanity and the gift of imperishable life. The children of God will enter into their promised inheritance, beholding forever the glory of their Father shining forth in his Son. “When we come to the end of all our pilgrimage,” Osborn declares, “our final vision shall be the face of him who was born of Mary.”11
St Irenaeus’s narrative of salvation would be appropriated and adapted by later theologians. Origen, St Athanasius, St Gregory of Nyssa, St Cyril of Alexandria—each developed elements of his narrative as they sought to proclaim the gospel of theosis. Yet its truth is already anticipated in the bishop of Lyons’s celebrated words:
For the glory of God is a living man, and the life of man is the vision of God. If the revelation of God by the creation already gives life to all the beings living on earth, how much more does the manifestation of the Father by the Word give life to those who see God! (AH IV.20.7).
- “Although he never employed the language of theopoiesis or theosis, already present in the theology of Irenaeus are all the essential elements of what would come to be regarded as the characteristically patristic understanding of sanctification as divinization: restoration of prelapsarian likeness to God and incorruptibility, initiated by the union of human nature with divine nature through the incarnation, life, death, and resurrection of the Eternal Son, appropriated existentially as adoption by God and infusion by the Holy Spirit, and finally perfected eternally through the face to face vision of God.” Jeffrey Finch, “Irenaeus on the Christological Basis of Human Divinization,” in Theosis (2006), 86-87. ↩︎
- Denis Minns, Irenaeus (2010), 69. ↩︎
- John Behr, Irenaeus of Lyons (2013), 145. ↩︎
- Ibid., 185. ↩︎
- Ibid., 146. Irenaeus is not engaging in the kind of speculation that would be raised in medieval theology: Would God have become man if Adam had never sinned. He is exegeting Scripture and therefore only thinking only in terms of the biblical story. ↩︎
- M. C. Steenberg, “Children in Paradise,” Journal of Early Christian Studies 12 (2004), 15-16. ↩︎
- Eric Osborn, Irenaeus of Lyons (2003), 132. ↩︎
- Behr, 155. ↩︎
- Osborn, 115-116. ↩︎
- Ibid., 115-116. ↩︎
- Ibid., 210. ↩︎









