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Incarnation
The eternal Son of God becoming flesh — God genuinely entering human history as a human being; the central event of history.
The Incarnation is the central event of history: the eternal Son of God, the second Person of the Trinity, taking on a complete human nature — body, rational soul, and will — in the womb of the Virgin Mary. 'The Word became flesh and dwelt among us' (John 1:14). Orthodox theology insists the Incarnation is genuine: not an appearance of humanity, but the eternal Son genuinely, permanently, and irrevocably becoming human.