And there shall come forth a rod out of the stem of Jesse, and a Branch shall grow out of his roots:
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Ambrose of Milan
AD 397
Also in Isaiah is it written: “There will come forth a rod out of the root of Jesse, and a flower will go up from his root.” The root is the family of the Jews, the rod is Mary, and the flower is her Christ. When he blossoms in our land, makes fragrant the field of the soul, and flourishes in his church, we can no longer fear the cold or rain, but only anticipate the day of judgment. - "Apology on David 8.43"
Scripture also expresses the Son’s incarnation beautifully: “from a bud you have gone up,” for like a plant of the earth he was to be conceived in the womb of a virgin. And like a fragrant flower sent forth from the maternal bosom in the splendor of the dawn, he was to go up for the redemption of the whole world, as Isaiah says: “There will come forth a rod out of the root of Jesse, and a flower will blossom from his root.” The root is the family of the Jews, the rod is Mary, and the flower is her Christ. It is right, therefore, that the rod which is of royal lineage from the house of David, whose flower is Christ, who vanquished the foul odor of worldly filth, poured forth the fragrance of eternal life. - "On the Patriarchs 4.19–20"
The root of Jesse the patriarch is the family of the Jews, Mary is the rod, Christ the flower of Mary, who, about to spread the good odor of faith throughout the whole world, budded forth from a virgin womb, as he himself said: “I am the flower of the plain, a lily of the valley.” - "On the Holy Spirit 2.5"
Jacob also prayed when he returned back from Laban, and he was rescued from the hands of his brother, Esau. He prayed as follows, confessing and saying, “With my staff have I crossed this river Jordan, and now I have become two camps.” Wondrous symbol of our Savior! When our Lord first came, the staff left the stem of Jesse, just like Jacob’s staff; and when he returns from his Father’s house at his second coming, he goes back to him with two camps, one from the people [Israel], the other from the peoples [nations]—just like Jacob who returned to his father Isaac with two camps. - "Demonstration 4.6"
David was the king of Israel and the son of Jesse at a certain time in the Old Testament, when the New Testament was still hidden there in the Old, like a fruit in its root. For if you seek the fruit in its root, you will not find it. But neither would you find the fruit in the branch, unless it had first come from the root.
At that time, then, the first people had come from the seed of Abraham carnally. The second people, those who belong to the New Testament, also belong to the seed of Abraham, but spiritually. Those first people who were still carnal, therefore, among whom very few prophets understood both what was to be desired from God and when to announce it publicly, foretold this future time and the advent of our Lord Jesus Christ.
Insofar as Christ himself was born according to the flesh, he was hidden in the root, in the seed of the patriarchs, and was to be revealed at a certain time, like fruit appearing on the branch, as it is written: “A rod will bloom from the root of Je...
The prophet Isaiah testified that it was necessary that our Redeemer be conceived in Nazareth when he said, “There will come forth a rod out of the root of Jesse, and a nazareus will go up from his root.” Nazareus can be translated either as “flower” or as “pure.” The Son of God who was made flesh for us can rightly be called by these names because he assumed a human nature which was pure of every vice and because he is the font and source of spiritual fruit for all who believe in him, to whom he also both showed an example and granted the gift of righteous and blessed living. - "Homilies on the Gospels 1.6"
The seven lamps are the seven gifts of the Holy Spirit, all of which remain in our Lord and Redeemer forever and are distributed in his members (that is, in all the elect) according to his will. Therefore the seven lamps are set upon the lampstand because upon our Redeemer, the firstborn “from the root of Jesse,” rested “the Spirit of wisdom and of understanding, the Spirit of counsel and of fortitude, the Spirit of knowledge and of godliness,” and he was filled “with the Spirit of the fear of the Lord.” As he himself also says through the same prophet, “The Spirit of the Lord is upon me because the Lord has anointed me.” - "On the Tabernacle 1.9"
For it is history when something is reported as having been done or said in plain discourse according to the letter; for example, the people of Israel, after they had been delivered from Egypt, are said to have made a tabernacle for the Lord in the wilderness. It is allegory when the presence of Christ and the sacraments of the church are designated by mystical words or things; by words, certainly, as when Isaiah says, “A shoot [virga] shall come forth from the root of Jesse, and a flower shall rise up from his root,” which is to say openly, “The Virgin Mary will be born from the stock of David, and Christ will proceed from his lineage”; and by things, as when the people delivered from Egyptian slavery through the blood of the lamb signifies the church freed from the devil’s domination by the passion of Christ. - "On the Tabernacle 1.6"
The prophet Isaiah bears witness that our Redeemer had to be conceived in Nazareth when he says, “A nazareus will ascend from his root.” The term nazareus has the meaning of “flower” or “clean.” The Son of God made incarnate for us can properly be named by this term, both because he adopted the nature of a human being clean from all vices and because in him the font and origin of spiritual fruits came forth for all believers, since to them he both pointed out examples and granted the fruits of living properly and blessedly. - "Homilies on the Gospels 1.6"
Elsewhere, the Holy Spirit also speaks of the Virgin about to give birth when he says, “There will come forth a rod out of the root of Jesse, and a flower will arise from his root.” The rod from the root of Jesse signifies the Virgin Mary, who found her origins in the stem of Jesse through David. For, as the Evangelist or apostle reveals, out of the tribe of David came the Virgin Mary, from whom the flower of human flesh arose in Christ. This is the rod which, having been placed in the ark of testimony to be a sign for everlasting memory, has now by a new and wonderful mystery, without moisture from the earth, brought forth the fruit of the almond. It is by this miracle that Aaron’s priesthood was confirmed. - "Tractate on Matthew 2.5"
He is the son of Mary, however, and not the son of Joseph. He did not appear in the body from any other lineage, except from David. - "Commentary on Tatian’s Diatessaron 26"
It is prophesied that one will come forth of the seed of Jesse, that is to say, of David, many years after the death of both David and Solomon. - "Proof of the Gospel 7.3"
This shows in an obvious way that the birth of Christ would be from the root of Jesse, who was the father of David. This points toward the birth which the Gentiles would follow, having been prophetically announced by way of signs. - "Proof of the Gospel 2.3"
Root. Juda shall not be exterminated, like the Assyrians. (Calmet)
Christ shall spring from the blessed Virgin , (Worthington) for the salvation of mankind. The Jews agree, that this prediction regards the Messias; though some, with Grotius, would explain it literally of Ezechias. They do not reflect that he was now ten years old, and that the prophet speaks of an event which should still take place after he had been a long while upon the throne. If we were to look for any figure of the Messias, to whom this might be applicable, it would be Zorobabel, Zacharias iii. 8. But how disproportionate would be the promises to the execution? Some passages may indeed relate to the return of the captives, (ver. 11.) as the people must have a more immediate object, to insure the accomplishment of the more elevated predictions concerning the Messias: but these also refer ultimately to the propagation of the gospel, which the prophet had also in view. (Calmet)
In which rod, no doubt the blessed Virgin Mary is predicted, who sprung from the stock of Jesse and David and fecundated by the Holy Spirit, brought forth a new flower of human flesh, becoming a virgin-mother. (Pope St. Leo the Great Sermon 4) Or it could be that a flower refers to Christ; and it is probably implied indirectly by "rod" that he has royal dignity as well, a rod being a symbol of kingship. (St. Cyril of Alexandria) Or it could be that Jesse is the root, David the tree that through its branch, that is, Mary, has produced fruit, that is Christ.
Just as when a lion is born from a lion, the nature is not changed but is shown to have a common source, so also one who is born from God cannot be anything other than God. But he calls him a lion’s cub for the purpose of signifying the Son. Indeed, he adds “from a sprout, my son, you have gone up,” because he wants to show us that Christ came from the sprout of Judah, as it was also said through the prophet Isaiah: “there will come forth a rod [virga] out of the root of Jesse, and a flower will go up from his root.” This Jesse was the father of David, from whose root, that is, source, the Virgin Mary [maria virgo] was born. That Isaiah refers to a “rod” [virga] and to a “flower” from the rod suggests that the flower which is Christ would be born from a virgin [virgine]. - "Origen’s Tractate on the Books of Holy Scripture 6.35–36"
The land that before brought forth thorns, hears in Isaiah the blessing: “A shoot shall sprout from the stump of Jesse, and from his roots a bud shall blossom.” “You have turned away the captivity of Jacob.” The Lord has come, therefore, to proclaim pardon to captives. There is a parallel to this in another passage of Scripture: “He led captivity captive,” that is, we, who in former times had been captured by the devil to perdition, now are led away by the Savior to salvation. - "Homilies on the Psalms, Alternate Series, Psalm 84"
Until the beginning of the vision, or the burden of Babylon, which Isaiah the son of Amos saw, his entire prophecy was about Christ, a prophecy that we want to explain piecemeal lest the ideas and discussions thereof together confuse the reader’s memory. The Jews interpreted the branch and the flower from the root of Jesse to be the Lord himself because the power of his governance is demonstrated in the branch and his beauty in the flower. But we understand the branch from the root of Jesse to be the holy Virgin Mary, who had no shoot connatural to herself. About her we read above: “Behold, a virgin will conceive and bear a son.” And the flower is the Lord our Savior, who said in the Song of Songs, “I am the flower of the field and the lily of the valleys.” In place of “root,” which only the Septuagint translated, the Hebrew text has geza, which Aquila and Symmachus and Theodotus interpret as kormon, that is, “stem.” And they translated “flower,” which the Hebrew text calls nēṣer, as “...
We believe, therefore, in the immortal and invisible God, not in him whom the infidels have fashioned to be God, who is both an adulterer and a thunderer, but in the true God, Creator and Ruler of all the world.
We also hold to Jesus Christ his Son, formerly promised through the prophets, and we know that the promise has been fulfilled. Yet, because we were not present when it was fulfilled, we are also commanded to believe it. The Jews were present then, however, from whose race the Savior himself chose apostles through whom the faith has reached us. As a member of the very race in which and from which he deigned to be born, the prophet Isaiah predicted a long time ago: “Behold, a virgin will conceive in the womb and will bear a son, and you will call his name Emmanuel, which means ‘God with us.’ ”; And elsewhere [we read]: “There will come forth a rod out of the root of Jesse, and a flower will go up from his root.” The branch signifies the Virgin Mary, and the flower of the rod repr...
In him dwelt the fullness of the Spirit; therefore I acknowledge him to be “the rod of the stem of Jesse.” His blooming flower shall be my Christ, upon whom has rested, according to Isaiah, “the spirit of wisdom and understanding, the spirit of counsel and might, the spirit of knowledge and piety, and of the fear of the Lord.” Now to no man, except Christ, would this diversity of spiritual proofs suitably apply. He is indeed like a flower for the Spirit’s grace, reckoned indeed of the stem of Jesse but thence to derive his descent through Mary. - "Against Marcion 3.17"