Theosis is the supreme, overall goal of Basileia. Theosis is the name that the Greek speaking Church Fathers gave to the process and the goal of becoming partakers of the divine nature (2 Pet. 1:4). Theosis is often translated into English as “deification” or “divinization,” which is problematic because Theosis means something more profound than either of these translations express on their own. Poetically speaking, Theosis is to ‘shine like the sun in the kingdom of” our Father (Matt. 13:43). Prosaically speaking, Theosis is the coming from above, from outside and beyond us, of divine power in the Person of God Himself, to dwell with us, taking on our form, and in this way freeing us from the evil power of sin, Satan and death that has imprisoned us in lesser mortal versions of ourselves in order to thereby lift us up with Him to glory as immortal sons of the resurrection who in union with God partake of His living presence and become embodiments of His saving acts as Creator and Redeemer on behalf of all creation.
Also see Partakers of the Divine Nature, Shine Like the Sun, and Theanthropomorphic.
Articles on Theosis:
Becoming Like God: An Evangelical Doctrine of Theosis
Luther and Theosis
Partakers of Divinity: The Orthodox Doctrine of Theosis
Shine As The Sun: C.S. Lewis and the Doctrine of Deification
The Weight of Glory by C.S. Lewis
Theosis: True Purpose of Human Life