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Communicatio Idiomatum
Communication of properties — predicates of either nature apply to the one Person of Christ, so God truly suffered and died.
Because the divine and human natures are united in one Person, properties of either nature can be predicated of that single Person. Therefore: God was born, God suffered, God died. This principle was central to Ephesus (431 AD): Nestorius's refusal to say 'God was born of Mary' was what provoked the controversy over Theotokos. The principle follows necessarily from the hypostatic union.