Nestorius's teachings became the reason of controversy when he publicly challenged the long-used title Theotokos ("God Bearer") for Mary. He suggested that the title denied Christ's full humanity, arguing instead that Jesus had two persons (dyoprosopism), the divine logos and the human Jesus.
Nestorius refused to call Mary the "Mother of God". Her baby was very human, he said. Jesus' human acts and sufferings were of his human nature, not his Godhead. To say Mary was Mother of God was to say God had once been a few hours old. "God is not a baby two or three months old," he argued.
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