And knew her not till she had brought forth her firstborn son: and he called his name JESUS.
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This error then is barred by the Evangelist saying, “That it might be fulfilled which was spoken of the Lord by the Prophet. "Now one kind of prophecy is by the preordination of God, and must needs be fulfilled, and that without any free choice on our part. Such is that of which we now speak; wherefore he says, “Lo,” to show the certainty of prophecy. There is another kind of prophecy which is by the foreknowledge of God, and with this our free will is mixed up; wherein by grace working with us we obtain reward, or if justly deserted by it, torment. Another is not of foreknowledge, but is a kind of threat made after the manner of men; as that, “Yet forty days, and Nineveh shall be overthrown;” understanding, unless the Ninevites amend themselves. He not only did what the Angel commanded, but as he commanded it. Let each one who is warned of God, in like manner, break off all delays, rise from sleep, and do that which is commanded him.
He is “first-born” among the elect by grace; but by nature the Only-begotten of God the Father, the only Son of Mary. “And called His name Jesus,” on the eighth day on which the circumcision took place, and the Name was given.