ישעיהו, פרק ס״ה, פסוק י״ד

The profound gap between the destinies of the righteous and the wicked takes physical form through the sounds they make. Following a grand feast, where it is natural to raise one's voice in joyful song after eating and drinking, the servants of God will sing out in pure gladness [רד״ק]. This joyous singing springs from a genuinely good heart. They are filled with true happiness over their own blessings and the rebuilding of Zion, rather than taking any spiteful joy in the suffering of the wicked [מלבי״ם, ביאור שטיינזלץ].

On the other side, the wicked will also raise their voices, but their sounds will be entirely different, filled with sorrow, grief, and deep sadness [רד״ק, מצודת ציון, ביאור שטיינזלץ]. There is a crucial distinction in the types of suffering they experience. A painful heart represents an external pain; it is a state where a person still cries out in an active plea for rescue. A broken spirit, however, points to a profound inner distress marked by complete despair and a total loss of hope. Broken from within, the wicked no longer scream for help. Instead, they merely wail, uttering cries of mourning over a past that is forever lost [מלבי״ם]. Their voices are reduced to pure expressions of weeping and lamentation [מצודת ציון, ביאור שטיינזלץ].