The doctrine of theosis has enjoyed a recent resurgence among varied theological traditions across the realms of historical, dogmatic, and exegetical theology. In Christification: A Lutheran Approach to Theosis, Jordan Cooper evaluates this teaching from a Lutheran perspective. He examines the teachings of the church fathers, the New Testament, and the Lutheran Confessional tradition in conversation with recent scholarship on theosis. Cooper proposes that the participationist soteriology of the early fathers expressed in terms of theosis is compatible with Luther's doctrine of forensic justification. The historic Lutheran tradition, Scripture, and the patristic sources do not limit soteriological discussions to legal terminology, but instead offer a multifaceted doctrine of salvation that encapsulates both participatory and forensic motifs. This is compared and contrasted with the development of the doctrine of deification in the Eastern tradition arising from the thought of Pseudo-Dionysius. Cooper argues that the doctrine of the earliest fathers--such as Irenaeus, Athanasius, and Justin--is primarily a Christological and economic reality defined as "Christification." This model of theosis is placed in contradistinction to later Neoplatonic forms of deification.

'Deification' refers to the transformation of believers into the likeness of God. Of course, Christian monotheism goes against any literal 'god making' of believers. Rather, the NT speaks of a transformation of mind, a metamorphosis of character, a redefinition of selfhood, and an imitation of God. Most of these passages are tantalizingly brief, and none spells out the concept in detail.

Theosis, or the principle of divine-human communion, sparks the theological imagination of Orthodox Christians and has been historically important to questions of political theology. In The Mystical as Political: Democracy and Non-Radical Orthodoxy, Aristotle Papanikolaou argues that a political theology grounded in the principle of divine-human communion must be one that unequivocally endorses a political community that is democratic in a way that structures itself around the modern liberal principles of freedom of religion, the protection of human rights, and church-state separation. Papanikolaou hopes to forge a non-radical Orthodox political theology that extends beyond a reflexive opposition to the West and a nostalgic return to a Byzantine-like unified political-religious culture. His exploration is prompted by two trends: the fall of communism in traditionally Orthodox countries has revealed an unpreparedness on the part of Orthodox Christianity to address the question of political theology in a way that is consistent with its core axiom of theosis; and recent Christian political theology, some of it evoking the notion of “deification,” has been critical of liberal democracy, implying a mutual incompatibility between a Christian worldview and that of modern liberal democracy. The first comprehensive treatment from an Orthodox theological perspective of the issue of the compatibility between Orthodoxy and liberal democracy, Papanikolaou’s is an affirmation that Orthodox support for liberal forms of democracy is justified within the framework of Orthodox understandings of God and the human person. His overtly theological approach shows that the basic principles of liberal democracy are not tied exclusively to the language and categories of Enlightenment philosophy and, so, are not inherently secular.

Theosis, originally a Greek term for Christian divinisation or deification, has become a vogue word in modern theology. Although recent publications have explored its meaning in a selection of different contexts, this is the first book to offer a coherent narrative of how the concept of theosis developed in both its Eastern and Western versions. Norman Russell shows how the role of Dionysius the Areopagite was pivotal, not only in Byzantium but also in the late mediaeval West, where it strengthened the turn towards an individualistic interiority. Russell also relates theosis to changing concepts of religion in the modern age. He investigates the Russian version of theosis, introduced in the West by Russian members the Paris School after the 1917 Revolution. Since then, theosis has undergone additional development through the addition of esoteric elements which have since passed into the mainstream of all theological traditions and even into popular spirituality.

Evangelicalism is reaching an inflection point. The exodus of millennials from Evangelical churches and the growth of those self-identifying as "Nones," as in "None of the Above," for their church affiliation, is concerning for the movement's future. Evangelical leaders offer mixed responses to this challenge--from circling the wagons to an enthusiastic "Everything must change!" posture. Theosis takes a different approach. Seeking to understand Evangelicalism and its origins, this book suggests that Evangelicalism is best understood as the sibling of western, Enlightenment Modernity, which served it well . . . until the modern cultural ethos began to shift dramatically toward post-modernity. In this shift, young Evangelicals--principally postmoderns themselves--are abandoning "their father's Evangelicalism" and its perceived linearity, hyper-rationalism, either/or exclusivity, and faith expression, too often perceived as stripped of mystery and wonder. Theosis proposes that to move forward, Evangelicalism must go back to the future, to re-engage with the patristic understanding of salvation as theosis; deification, or union with God. This radical return--and broadening of the doctrine of salvation--has begun to gain traction in Western Christendom, slowly being considered as it has always in the Christian East, as mere Christianity.

Theosis shapes contemporary Orthodox theology in two ways: positively and negatively. In the positive sense, contemporary Orthodox theologians made theosis the thread that bound together the various aspects of theology in a coherent whole and also interpreted patristic texts, which experienced a renaissance in the twentieth century, even in Orthodox theology. In the negative sense, contemporary theologians used theosis as a triumphalistic club to beat down Catholic and Protestant Christians, claiming that they rejected theosis in favor of either a rationalistic or fideistic approach to Christian life. The essays collected in this volume move beyond this East–West divide by examining the relation between faith, reason, and theosis from Orthodox, Catholic, and Protestant perspectives. A variety of themes are addressed, such as the nature–grace debate and the relation of philosophy to theology, through engagement with such diverse thinkers as Thomas Aquinas, John Wesley, Meister Eckhart, Dionysius the Areopagite, Symeon the New Theologian, Panayiotis Nellas, Vladimir Lossky, Martin Luther, Martin Heidegger, Sergius Bulgakov, John of the Cross, Delores Williams, Evagrius of Pontus, and Hans Urs von Balthasar. The essays in this book are situated within a current thinking on theosis that consists of a common, albeit minimalist, affirmation amidst the flow of differences. The authors in this volume contribute to the historical theological task of complicating the contemporary Orthodox narrative, but they also continue the “theological achievement” of thinking about theosis so that all Christian traditions may be challenged to stretch and shift their understanding of theosis even amidst an ecumenical celebration of the gift of participation in the life of God.

Norman Russell's innovative study offers fresh insights into the developing concepts of theosis across Eastern and Western traditions.