Thomas Aquinas, on Job 2:8

“And he took a potsherd and scraped the corrupt matter, sitting on a dunghill.”

“The afflictions of the sick are customarily alleviated by cures applied externally which are pleasant. But Job was not alleviated in such a way, for the text continues, "Job scraped the bloody matter with a shard." In this the text shows that pleasant and soothing remedies are not applied to him. "And he sat in a dungheap," in which the text shows that he did not restore himself to health in a pleasant place, or in the gentleness of straw or with some pleasant smell, but he more used their opposite. This can have happened in two ways: either because after he was struck by the Lord, he voluntarily afflicted and humiliated himself even more to more easily obtain mercy, or because he lost everything he had, and so he could not afford suitable cures for himself. This is probable enough from what the Lord said above, and it does not seem that Satan had acted except with the power given him to harm something.”

Imported from an open dataset — not yet checked against the printed edition.