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What is…

What is Theosis?

Theosis is union with God — the goal and purpose of Orthodox Christian life, expressed by St. Athanasius: 'God became man so that man might become god.'

The Heart of It

Theosis (deification) is the Orthodox Christian understanding of salvation — the process by which a human person participates in the divine nature and is united with God. St. Athanasius expressed it: 'God became man so that man might become god.'

TheosisDoctrine Explainer
§ 01 — The Teaching

What the Church holds.

Scripture, the Councils, and the lived Liturgy — held together. These are the load-bearing points.

01Section 1

What Does Theosis Mean?

  • Theosis means participation in the divine nature (2 Peter 1:4) — not becoming God by essence, but sharing in His energies.
  • Orthodox theology distinguishes between God's unknowable essence and His uncreated energies, through which He truly communicates Himself.
  • Theosis is not reserved for mystics; it is the vocation of every baptized Christian.
  • It begins in this life and is fulfilled in the age to come.
02Section 2

How Does Theosis Happen?

  • Through the sacraments — especially Baptism, Chrismation, and the Eucharist — the Holy Spirit unites us with Christ.
  • Through prayer, fasting, and repentance, we cooperate with God's grace (synergy).
  • Through the ascetic struggle, we subdue the passions so that God can dwell in us.
  • The Church, the sacraments, and the saints are all means of theosis.
03Section 3

Theosis and Western Theology

  • Western Christianity often frames salvation primarily in forensic or juridical terms (justification, satisfaction).
  • Orthodoxy frames salvation as ontological transformation — a real change in the person's nature and relationship with God.
  • Both traditions affirm that salvation is a gift of grace; Orthodoxy emphasizes that grace is God Himself, not a created substance.
✦   Where to next?

Step from doctrine into prayer.

Doctrine becomes prayer becomes life. The Liturgy, the Jesus Prayer, and the parish near you are where the words on this page take flesh.