Thomas Aquinas Commentary Lamentations 1:21

"They have heard that I sigh; there is none to comfort me; All mine enemies have heard of my trouble; they are glad that thou hast done it: Thou wilt bring the day that thou hast proclaimed, and they shall be like unto me." — Lamentations 1:21 (ASV)

Here he denounces the fault of others, and in this, he does three things.

1. He denounces the failure of her allies: they have heard—that is, the Egyptians and others in whom I trusted have heard. A voice was heard on high of lamentation, of mourning, and weeping (Jeremiah 31:15).
2. He denounces the joy of her enemies: all my enemies have heard of my calamity; they have rejoiced that you have done it. Those who trouble me will rejoice when I am moved (Psalms 12:5).
3. As if secure in divine justice, he predicts their ruin: you have brought—that is, you will bring, because the event is so certain—a day of consolation, and they will be like me, sorrowful and afflicted. Behold, my servants shall eat, and you shall be hungry (Isaiah 65:13).