Someone recently asked on Facebook for what the best works on theosis were. It raised many resources I knew and a couple I wasn’t aware of. I’m not really staying up on the forefront of things now that I’m writing about justification in Paul. As to the question, I gave my to go-to volumes which are good primers: Daniel Keating’s Deification and Grace (mostly focused on patristic views), and Norman Russell’s Fellow Workers with God (patristic views in light of wider contemporary Orthodox perspectives). Of course, Russell’s The Doctrine of Deification in the Greek Patristic Tradition is the gold standard for patristics, and I’m partial to this Christosis volume which brings together Paul and theosis.

In the thread this was posted:

Question by an ignorant person for all: I get God’s communicable attributes, sanctification, and in this way taking on the divine nature, being conformed to Christ, etc. I get believers’ mystical union to Christ, Christ living in us, etc. Does Theosis go beyond this, and if so, how so? And how is that not a bad thing? And if it does not go beyond this, then why are people lusting over the peculiar terminology?

Is theosis a fad? If not, what’s it got going for it? These are good questions. Here’s the answer I gave:

I’m sure there is a fad element to this, but there is a coherence it provides that some of our current theological dichotomies miss. In the patristic tradition, the terminology of theosis served a catch-word for the whole salvation-historical work of God–uniting creation and new creation. As such, it is not primarily anthropological (merely regarding salvation) but theo-logical and salvation-historical. In that way, it served to speak to the whole story of the Bible. (In case you are interested, I spell this out further in a recent essay: “You Become What You Worship: Theosis and the Story of Bible,” Ex Auditu (2017): 1–20.) For patristic theologians, it also incorporated their cosmological framework, in that participation was what explained the way of all reality. God is the only true self-existent being, and all life inheres to him, so to the extent we have life, we are participating in God’s life, which is again a reaffirmation of a theo-logical perspective. Finally, it provides a coherence in the narration of anthropological salvation: it is not just “sanctification” but participating in the life of God, so it unites life now and life in the future, moral incorruption (sanctification) and somatic incorruption (resurrection). So, one term that captures all that is handy.

If you are looking for a little on this topic, here’s something as a primer on theosis and theosis for dummies.