Now all this was done, that it might be fulfilled which was spoken of the Lord by the prophet, saying,
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John Chrysostom
AD 407
To make what he said easier to understand, the angel makes reference to Isaiah, and not to Isaiah only but to God who speaks through Isaiah. For he does not refer this saying to Isaiah as such but to the God of all. Hence he did not say simply that “All this took place to fulfill what was spoken by Isaiah” but “All this took place to fulfill what the Lord had spoken by the prophet.” The mouth indeed was Isaiah’s, but the oracle was wafted from above. The Gospel of Matthew, Homily
Having established Joseph’s faith by all means—by past expectations, by future hopes, by present grace and by the honor given to himself—the angel then rings in the prophet also to give expression in support of all these, proclaiming beforehand the good things that are to occur to the world through the Son: Sins are removed and done away. “For he will save his people from their sins.” Here again the coming event exceeds all human expectation. From what are the people being saved? Not from visible warfare or barbarians but something far greater: from their own sins, a work that had never been possible to anyone before. The Gospel of Matthew, Homily
I hear many say, While we are here, and enjoying the privilege of hearing, we are awed, but when we are gone out, we become altered men again, and the flame of zeal is quenched. What then may be done, that this may not come to pass? Let us observe whence it arises. Whence then does so great a change in us arise? From the unbecoming employment of our time, and from the company of evil men. For we ought not as soon as we retire from the Communion, to plunge into business unsuited to the Communion, but as soon as ever we get home, to take our Bible into our hands, and call our wife and children to join us in putting together what we have heard, and then, not before, engage in the business of life.
For if after the bath you would not choose to hurry into the market place, lest by the business in the market you should destroy the refreshment thence derived; much more ought we to act on this principle after the Communion. But as it is, we do the contrary, and in this very way throw away a...
Do not think that only now in these recent times did God resolve to do these things, but from before, even from the beginning. For you know the prophets, Joseph, as the student of the law which you are. Remember what was spoken by the law. He did not say, "what Isaiah had spoken," but, "what the Lord had spoken." For it was not man who spoke, but God, through the mouth of the prophet, and therefore the oracle is trustworthy.