Isaías 9
Ambrose of Milan · Comentário Patrístico (catena)
Isaías 9:2
Therefore, he had the pledge of immortality: but being placed in the shadow of life, he could not see and grasp the hidden life with Christ in God by some common touch and sight. And if not yet a sinner, certainly not of an incorruptible and inviolable nature; for he who has fallen into sin is not yet a sinner. Indeed, he was in the shadow of life; but those who are sinners are in the shadow of death. For the people of sinners, as Isaiah teaches (Isaiah 9:2), sat in the shadow of death, until the light arose through the grace of God, not through their own merit. Therefore, there is no distinction between the breath of God and the food of the tree of life. No man can claim to possess more than what has been bestowed upon him by divine generosity. — On Paradise 5.29
Isaías 9:6
Therefore, in order to call the Gentiles to the grace of his resurrection (for it is indeed a rich and fertile land that produces eternal fruits, fruits a hundred and sixty times over), he subjected his shoulder to work, subjecting himself to the cross, in order to carry our sins. And so the Prophet says: His authority is on his shoulder (Isaiah 9:6), that is, the power of divinity over the bodily passion, or the cross surpassing the body. Therefore, he placed his shoulder on the plow, enduring all insults, subjected to labor in such a way that he was wounded because of our iniquities, and weakened because of our sins. — On the Blessings of the Patriarchs 6.31
Isaías 9:6
So we have in another place: "A child is born to us, and a son is given to us." In the term child there is an indication of age; in the term son a reference to the fullness of Godhead. He was made of his mother and born of the Father, but as the same person he was born and given. Do not think of two but of one. For the Son of God is one person, born of the Father and sprung from the virgin. The names differ in order but unite in one, just as the scriptural lesson just read teaches: "Man was made in her, and the Highest himself has founded her." He was man indeed in body, but the Highest in power. And while he is God and man through diversity of nature, he is the same person, not two persons, though being God and man. He has, therefore, something peculiar to his own nature and something in common with us, but in both cases he is one and in both he is perfect. — On the Death of Satyrus 1.12
Isaías 9:6
And not only did the Father send the Son but also gave him, as the Son himself gave himself. For we read, "Grace to you from God our Father and the Lord Jesus Christ, who gave himself for our sins." If they think that the Son was subjected to God because he was sent, they cannot deny that it was of grace that he was given. But he was given by the Father, as Isaiah said: "Unto us a child is born, unto us a son is given." But he was given by the Spirit and was sent by the Spirit. For since the prophet has not defined by whom he was given, he shows that he was given by the grace of the Trinity; and inasmuch as the Son himself gave himself, he could not be subject to himself according to his Godhead. Therefore that he was given could not be a sign of subjection in the Godhead. — On the Holy Spirit 3.2.9
Isaías 9:6
Christ, then, is the beginning of our virtue. He is the beginning of purity, who taught maidens not to look for the embraces of humanity but to yield the purity of their bodies and minds to the service of the Holy Spirit rather than to a husband. Christ is the beginning of frugality, for he became poor, though he was rich. Christ is the beginning of patience, for when he was reviled, he reviled not again. When he was struck, he did not strike back. Christ is the beginning of humility, for he took the form of a servant, though in the majesty of his power he was equal with God the Father. From him each various virtue has taken its origin.For this cause, then, that we might learn these different virtues, "a son was given us, whose beginning was upon his shoulder." That "beginning" is the Lord's cross—the beginning of strong courage, wherewith a way has been opened for the holy martyrs to enter the sufferings of the holy war. — Exposition of the Christian Faith 3.7.52-53