Gregory the Dialogist

He will not withdraw His eyes from the righteous, but establisheth kings on the throne for ever, and there are they exalted. For God is perhaps believed to have withdrawn His eyes from the righteous, because they are here wounded by the injustice of the unrighteous, and are unavenged. But He then more regards His servants, when the iniquity of their persecutor unjustly afflicts them. For, beholding what they here humbly endure, He doubtless even now looks forward to the recompense He is there mercifully to bestow on them. …

Morals on the Book of Job, Book XXVI ↗

Thomas Aquinas

He does not desist because of power from the assistance of the just, and so he says, "He does not take away from the just," even the powerful man, "his eyes," the gaze of his goodness and mercy, according to Psalm 33, "The eyes of the Lord are on the just." (v. 16) Since he does not take his mercy away from the powerful if they are just, he shows the benefits which he confers on the powerful. First, he confirms their power, and so he says, "And he places kings on the throne for all time," if they have been just. …

Commentary on Job ↗