Life and Controversy
Athanasius was born in Alexandria around 296 AD, likely to a Christian family, and received a thorough education in both Greek literature and theology. He became deacon and secretary to Bishop Alexander of Alexandria, and attended the Council of Nicaea in 325 as part of Alexander's delegation — at perhaps twenty-nine years of age. Three years later, upon Alexander's death, he was elected Bishop of Alexandria, an office he would hold — with many interruptions — for the next forty-five years.
Those interruptions define his legacy. Athanasius was exiled five times by four different emperors — Constantius, Julian, Jovian, and Valens — spending a total of roughly seventeen years away from his see. Each exile was the result of his refusal to compromise on the full divinity of the Son against the various forms of Arianism that dominated the imperial Church through much of the fourth century. Athanasius contra mundum — Athanasius against the world — became the phrase that defined his stance.
His return from the third exile in 346 was met with popular celebration throughout Egypt. His influence on the Eastern monastic movement — cemented by his Life of Antony — gave him an authority that transcended episcopal politics. When he died in his see in 373, he had outlasted most of his opponents, and the Council of Constantinople in 381 vindicated the Nicene theology he had championed for fifty years.
Theology
The Divinity of the Son
The central controversy of Athanasius's career was the Arian heresy. Arius, a priest of Alexandria, taught that the Son of God was a creature — the highest of all creatures, created before time, but not eternal and not of the same essence as the Father. His formula — "there was a time when he was not" — was theologically precise and, to many, intuitively attractive: it preserved the simplicity and uniqueness of the Father by making the Son a dependent being.
Athanasius recognized immediately that the Arian position was soteriologically catastrophic. His argument, developed in the Orations against the Arians, runs as follows: only God can save. If the Son is a creature, the Son cannot deify us — a creature cannot communicate divine life to other creatures. The entire logic of salvation — that human nature is healed and elevated in the Incarnation — requires that the one who assumes human nature is fully, truly God. A semi-divine being would be incapable of the task.
The word chosen at Nicaea — homoousios, "of the same essence" — was the one Athanasius defended throughout his life, against those who preferred the compromise formula homoiousios, "of similar essence." The difference of a single iota, as the saying goes, was everything. Similarity is not identity; a similar God is not God.
The Theology of Deification
Athanasius's most enduring theological contribution is his theology of theosis, expressed most compactly in his formula from On the Incarnation: "He became man that we might become god." This formula must be read in context. Athanasius is not suggesting a metaphysical fusion of the human person with the divine essence — that would be pantheism. He is asserting that the Incarnation opens the possibility of genuine participation in the divine life: not by nature, but by grace.
"He, indeed, assumed humanity that we might become God. He manifested Himself by means of a body that we might receive the idea of the unseen Father. He endured the insolence of men that we might inherit immortality."
— On the Incarnation, Ch. 54 [Verify text and translation before publication]
The logic of this theology is tightly bound to his anti-Arian Christology. It is precisely because the Son is fully God that his assumption of human nature can effect the deification of human nature. A merely superior creature assuming human nature would accomplish nothing of the sort.
The Holy Spirit
Athanasius also contributed significantly to the theology of the Holy Spirit in his Letters to Serapion, written against the Pneumatomachoi ("fighters against the Spirit") who accepted the full divinity of the Son but denied it to the Spirit. His argument follows the same soteriological logic: the Spirit is the one who unites us to Christ and communicates the divine life to us. If the Spirit is a creature, this communication cannot make us partakers of the divine nature. The Spirit must be fully God for theosis to be possible.
Major Works
The chronology of Athanasius's works is disputed, but the following represent his most theologically significant writings.
On the Incarnation (De Incarnatione Verbi, c. 318)
Written early in his career — possibly while still a deacon — this treatise is a comprehensive account of why the Son of God became man. Beginning with creation and the fall, it argues that the corruption introduced by the fall required a response equal to its scale: only the Creator could restore the creature. The treatise moves through the life, death, and resurrection of Christ as the definitive answer to human corruption and death. It remains one of the most accessible and powerful works of Patristic theology. C.S. Lewis's preface to an English translation helped introduce a new generation of readers to it in the twentieth century.
Against the Arians (Orationes contra Arianos, c. 356)
Four orations (the fourth is possibly not by Athanasius) representing his most sustained theological engagement with the Arian position. The first oration refutes Arian exegesis; the subsequent orations develop a positive account of Nicene Christology and defend the key term homoousios. This is the work in which Athanasius's full theological power is most evident.
Life of Antony (Vita Antonii, c. 357)
Written shortly after Antony's death in 356, this biography of the Egyptian desert father became the most influential hagiographical text in Christian history. Translated into Latin within a decade, it shaped the Western monastic tradition as much as the Eastern. Augustine's account of reading it in the Confessions — and of the moment it precipitated his conversion — testifies to its reach.
Letters to Serapion (Epistulae ad Serapionem, c. 359–360)
Four letters defending the full divinity of the Holy Spirit against the Pneumatomachoi. These letters are the foundational Patristic text for the Orthodox theology of the Spirit, anticipating the work of the Cappadocian Fathers — particularly Basil's On the Holy Spirit — by a generation.
Significance for the Orthodox Church
Athanasius is venerated in the Orthodox Church as "the Father of Orthodoxy" and as one of the great hierarchs and teachers of the Church. His feast is celebrated on May 2. The Nicene-Constantinopolitan Creed — recited at every Divine Liturgy — is the direct fruit of his fifty-year defense of Nicene theology. The formula homoousios that he refused to abandon is the word that every Orthodox Christian professes when they say "of one essence with the Father."
His theology of theosis — the deification of human nature as the purpose of the Incarnation — is not a peripheral element of Orthodox thought but its soteriological center. Everything in the liturgical and ascetic tradition of the Church — the sacraments, the fasts, the prayers, the icons, the veneration of saints — is ordered toward the participation of human persons in the divine life that Athanasius described as the purpose for which God became man.