Gregory the Dialogist

Because He hath opened His quiver and afflicted me. And put a bridle into my mouth. What is denoted by 'the quiver' of God, but secret counsel? Now the Lord casts the arrow from the quiver, when from His secret counsel He sends forth an open sentence. For that any man is scourged, we know, but for what cause the scourge comes, we know not. But when after the scourge amendment of life follows, the actual power of counsel is itself disclosed as well. So the quiver shut is hidden counsel. …

Morals on the Book of Job, Book XX ↗

Thomas Aquinas

Lest one think that he came into scorn because of some fault he had committed, he shows the cause of this contempt from the part of God who struck him. He shows first that he is afflicted by God when he says, "He opened up his quiver and struck me down." Arrows are taken out of a quiver which some use to wound someone. …

Commentary on Job ↗