Irenaeus of Lyons: Identifying Christianity

John Behr's study of Irenaeus emerges from decades of patristic scholarship and teaching at St. Vladimir's Orthodox Theological Seminary. Writing for both academic and ecclesial audiences, Behr seeks to recover the theological vision of the second-century bishop whose confrontation with Gnostic Christianity helped establish the contours of orthodox faith. Rather than treating Irenaeus merely as an early church historian or heresy-hunter, Behr presents him as a constructive theologian whose work remains vital for understanding Christian identity.

Behr argues that Irenaeus developed a coherent theological method centered on the "rule of faith" and the unity of Scripture's two testaments. Against Gnostic claims to secret knowledge and their rejection of the material world, Irenaeus insisted that God's revelation comes through the economy of salvation history, culminating in the incarnation of the Word. Behr demonstrates how Irenaeus's concept of recapitulation—Christ's summing up and renewal of human existence—provides both a christological foundation and an anthropological vision that affirms the goodness of creation while acknowledging the reality of the fall. The book shows how Irenaeus's theological imagination was fundamentally shaped by his pastoral concern for believers facing the allure of Gnostic spirituality, leading him to articulate a vision of salvation that encompasses the whole person within the material world.

Behr's interpretation has influenced contemporary patristic studies by highlighting Irenaeus's sophisticated theological method rather than focusing primarily on his anti-heretical polemics. The work demonstrates how second-century theological debates remain relevant for modern questions about Scripture, tradition, and the relationship between faith and knowledge. This book serves scholars of early Christianity and systematic theologians seeking to understand how foundational Christian doctrines emerged from concrete pastoral challenges. Readers looking for devotional material or popular-level church history should look elsewhere, as Behr writes primarily for those with theological training and familiarity with patristic sources.