Saint Cyril's importance for theology and church history lies in his championing the cause of orthodoxy against the heresy of Nestorious.
Cyril, presiding as the Pope's representative at the Council of Ephesus in 431, condemned Nestorianism and proclaimed Mary truly the "God-Bearer" (The Mother of the one person who is truly God and truly human). In the confusion that followed, Cyril was deposed and imprisoned for three months, after which he was welcomed back to Alexandria as a second Athanasius (The Champion against Arianism).
Quoting from Cyril He said: "Only if it is one and the same Christ who is consubstantial with the Father and with men can He save us, for the meeing ground between God and man is Flesh and Christ."
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