Isaías 8
John Chrysostom · Comentário Patrístico (catena)
Isaías 8:3
How was it, then, one may say, that his name was not called Emmanuel but Jesus Christ? Because he did not say "you shall call" but "they shall call," that is, the multitude and the issue of events. For here he uses an event (i.e., God being "with us") as a name; and this is customary in Scripture, to substitute the events that take place for names. Therefore, to say, "they shall call" him "Emmanuel" means nothing else than that they shall see God among humanity. For he has always been among them, but never so manifestly. — HOMILIES ON THE GOSPEL OF MATTHEW 5:2
Isaías 8:18
Not only do we become his brothers but even his children, for he says, "Behold, I and my children, whom God has given me." Not only do we become his children but also his members and his body. As if the things already mentioned were not enough to prove the love and kindness that he shows toward us, he set down another thing, greater and more intimate than these, when he spoke of himself as our head. — BAPTISMAL INSTRUCTIONS 12:14 (2:2)