Jerome : (Verse 11) On this account, my belly will sound like a lyre for Moab, and my inward parts like a wall of cooked bricks. It is not to be understood as a chant of joy for the prophet, through which he rejoices that the enemies of the people of Israel have been made captive, but rather, he says, with affection and deep sorrow of heart, that he mourns the formerly mighty city that has been destroyed. — Commentary on Isaiah Jerome : (Verse 11) The error of Moab has been destroyed; indeed, false joy has turned into mourning and tears. My belly, the prophet, who is composed like a lyre with musical skill, and who, conceived in the fear of God, has produced many children, so that there is no string that does not produce its sound, will resonate the lament of Moab, who is repenting: and all my bowels will be like a wall of baked bricks, as Theodotius interpreted it as a wall scattered. For all the defenses of opposites, in which they previously trusted, will be destroyed and will fall. These, however, are the bowels and inner parts of the prophet, about which David also said in the Psalm: Bless the Lord, O my soul, and let all my innards proclaim his holy name (Psalms 102, 1). For just as a lyre does not emit a vocal sound and harmonious, if at least one string is broken; similarly, the spiritual belly of the prophet, if one string of virtues is lacking in it, will not be able to resound sweet melody; nor proclaim with all its innards against the brick wall. It is also the opinion of the philosophers to cling to virtues; and the Apostle James says that if one is lacking one virtue, all virtues are lacking in that person. Moreover, according to the Septuagint version, we can explain the prophet's innermost thoughts being renewed by God, and him being ashamed, that is, Moab, and entering into the altars, and the things that are made by hand, so that we may say that the prophet's innermost thoughts are always renewed, and made stronger by God, so that their adversaries may be confounded, and they may understand that the things made by human hand are useless, and do not contribute to salvation. — Commentary on Isaiah