And he has made my mouth like a sharp sword; in the shadow of his hand has he hid me, and made me a polished shaft; in his quiver has he hid me;
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Ambrose of Milan
“In my quiver he hid me away,” Scripture declares. The quiver, then, is your faith. Fill it with the frangrant aroma of your virtues, that is, of chastity, compassion and justice, and immerse yourself wholly in the inmost mysteries of faith, which are fragrant with the sweet odors of your significant deeds. - "Six Days of Creation 5.23.80"
The name Christ is not appropriate for God the Word before the generation that, as I said, was according to the flesh. If he was then not yet anointed, how could he be called “Christ”? But when the man came forth from his mother’s womb, then he received the name at the same time as the generation according to the flesh. For it says that he “set his mouth like a sharp sword” … for no one can overcome his all-powerful right hand, but the Word is kept distinct from the dimensions of the humanity. For he is the Word from the Father and himself is the Lord of hosts. When he became man, the Father did not remove the power of the mystery but confirmed him in the economy of salvation.… There have been several arrows of God hidden in his quiver, in his foreknowledge, and brought out at the time prepared for each, but the chosen arrow above all others is the Christ hidden in the quiver or foreknowledge of God. For he was known before the creation of the world and brought forth in the middle of t...
Sword, penetrating the very soul, (Hebrews iv. 12.) and slaying the wicked, Apocalypse i. 16., and 2 Thessalonians ii. 8. Without Christ, his ministers can apply this sword to little purpose. Cyrus cut asunder the bonds of the captives by his decree. (Calmet)
Grotius improperly explains all of Isaias. (Houbigant)
When it says “chosen arrow,” it implies that God has many arrows but not choice ones—these arrows are the prophets and apostles, who go shooting off around the world.… But Christ is the one arrow chosen from many arrows and one son from many sons, which he hid in his quiver, that is, in his human body, so that the fullness of divinity could dwell in him bodily and that the faith of believers be distributed. - "Commentary on Isaiah 13.19"