Fairbairn on Cassian on Christ

Don Fairbairn, in Grace and Christology in the Early Church, cites the church father Cassian's reponse to Nestorious, saying, "If it seems unreasonable to you that Mary could give birth to God who was anterior to her, how will it seem reasonable that God was crucified by men? And yet the same God who was crucified himself predicted, 'Shall a man afflict God, for you afflict me? [Mal. 3:8] If then we may not think that the Lord was born of a virgin because he who was born was anterior to her who bore him, how could we believe that God had blood? And yet it was said to the Ephesian elders, 'Feed the Church of God, which he purchased with his own blood' [Acts 20:28]. Finally, how can we think that the Author of life was himself deprived of life? And yet Peter says, 'You have killed the Author of life' [Acts 3:15]. (p. 186)