Gregory the Dialogist

Let us implore the tears of Jeremiah; let him consider our death, and lamenting say: "How is the gold become dim, the most fine color is changed, the stones of the sanctuary are scattered at the head of every street." For the gold has become dim, because the life of priests, once bright through the glory of virtues, is now shown to be reprobate through the basest actions. The most fine color is changed, because that habit of holiness has come to the disgrace of contempt through earthly and abject works. …

Forty Gospel Homilies, Homily 17 ↗

Thomas Aquinas

Here the misery of the siege is principally lamented, which is considered in two ways. In the first way the misery of the people is bewailed, in the second way the joy of those deriding is laid bare. As said in Verse 21: "Rejoice and be glad, O daughter of Edom, dweller in the land of Uz; but to you also the cup shall pass; you shall become drunk and strip yourself bare." As to the misery of the people there are two further notions. First the affliction of the people themselves is bewailed, second their lack of power to resist. …

Commentary on Lamentations ↗