Gregory the Dialogist

But now my soul in mine own self is withered, and the days of affliction have taken hold upon me. Since 'the soul' of the Elect 'withers now,' because it is afterwards made green in that eternal triumphing. 'Now, the days of affliction take hold upon them,' because the days of joy follow afterwards. As it is written, To him that feareth God it shall go well at the last. And again it is delivered touching the Church, And she shall laugh in the last day. …

Morals on the Book of Job, Book XX ↗

Thomas Aquinas

When his desirable goods had been taken away, his soul remained in sadness, and so he says, "Now my soul droops within me," through sadness. He truly could not have been anything but sad, after he had lost his children and his property. Because he had lost the health of his body, consequently he also felt corporeal pain, which gave him no rest even in the day, and so he says, "days of pain," physical suffering which gets worse at night, "take possession of me."

Commentary on Job ↗