"A sure warrant for looking forward with hope to deification of human nature is provided by the incarnation of God, which makes man god to the same degree as God himself became man.... Let us become the image of the one whole God, bearing nothing earthly in ourselves, so that we may consort with God and become gods, receiving from God our existence as gods. For it is clear that He who became man without sin (cf. Heb. 4:15) will divinize human nature without changing it into the divine nature, and will raise it up for his own sake to the same degree as He lowered himself for man's sake. This is what St Paul teaches mystically when he says, '...that in the ages to come he might display the overflowing richness of His grace' (Eph. 2:7)."
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This is the EO doctrine of theosis in a nut-shell. The quote is from St. Maximus the Confessor (580-662), and is found in the Philokalia, Vol II, 178.