And she shall bring forth a son, and you shall call his name JESUS: for he shall save his people from their sins.
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It was as if the angel were saying to Joseph, “Do not imagine that, because he is conceived of the Holy Spirit, that you have no part in the ministry of this new dispensation. In the conception you had no part. You never touched the virgin. Nevertheless I am giving you what pertains to a father. I give you the honor of giving a name to the One who is to be born. For you, Joseph, shall name him. For though the offspring is not your own, yet you are called to exhibit a father’s care toward him. So on this occasion, at this moment of giving him a name, you stand in significant relation with the one who is born.” Then lest on the other hand anyone should, out of all this, suspect him to be the father, hear what follows and with what exact care the angel states it: “She shall bring forth a Son.” He does not say “bring forth to you” but merely “she shall bring forth,” putting it indefinitely, since it was not merely to him that she brought forth, but to the whole world. The Gospel of Matthew, Homily