Behold, a virgin shall be with child, and shall bring forth a son, and they shall call his name Emmanuel, which being interpreted is, God with us.
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Ap Anselm: Or, he says, “all this was done,” meaning, the Virgin was betrothed, she was kept chaste, she was found with child, the revelation was made by the Angel, that it might be fulfilled which was spoken. For that the Virgin should conceive and should bring forth would never have been fulfilled, had she not been espoused that she should not be stoned; and had not her secret been disclosed by the Angel, and so Joseph taken her unto him, that she was not dismissed to disgrace and to perish by stoning. So had she perished before the birth, that prophecy would have been made void which says, “She shall bring forth a Son.” .
Or it may be said, that the word “that” does not here denote the cause; for the prophecy was not fulfilled merely because it was to be fulfilled. But it is put consecutively, as in Genesis, “He hung the other on the gallows, that the truth of the interpreter might be proved;” since by the weighing of one, truth is established. So also in this place we must understand it as if it were, that which was foretold being done, the prophecy was accomplished.
in Anselm: 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 akind of threat made after the manner of men; as that, “Yet forty days, and Nineveh shall be overthrown;” understanding, unless the Ninevitesamend themselves.