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Prot Theology: "But by a special intervention of God, undertaken at the instant she conceived"
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The biblical accounts clearly emphasize the miraculous nature of Mary's impregnation. Please explain why a second miracle, unrecorded in the Bible, needs to be posited. An omnipotent God can, and I believe did, miraculous preserve the Saviour from the taint of original sin at the point of Mary's impregnation.