Jerome : (Verse 16, 17.) And the Lord saw, and evil appeared in his eyes: because there is no justice, and he saw that there is no man, and he was astonished, because there is no one to oppose. And his own arm will save him: and his righteousness itself will strengthen him. He is clothed with righteousness as with a breastplate, and the helmet of salvation on his head. He is clothed with garments of vengeance, and covered with a cloak of zeal. As for revenge, it is like retaliation for his enemies, and retribution for his foes; he will repay the islands. LXX: The Lord saw, and it displeased him that there was no justice. He saw that there was no man, and wondered that there was no one to intercede; then his own arm brought him salvation, and his righteousness upheld him. He put on righteousness as a breastplate, and a helmet of salvation on his head; he put on garments of vengeance for clothing, and wrapped himself in fury as in a mantle, repaying his enemies with their just deserts. Up to this point, the prophetic discourse has been from the perspective of the people: now the prophet speaks from his own perspective. While they were saying these things, the Lord saw that they were professing repentance with their mouths, but not acting with their hearts, and this did not please Him. For He sought truth in judgment among them, which had been transferred to the nations, but He did not find it. He desired a righteous man who could meet Him in anger, but He did not find one; as He had previously said: 'I came, and there was no man; I called, and there was none to hear.' (Isaiah 50:2) And because those who persist in wickedness, not even one righteous person is found: but all have turned away, and together they have become useless; there is no one who does good, not even one (Psalms 14). But God has strengthened him with his arm and righteousness, and confirmed him with mercy, so that those who desire to turn from error may be saved not by their own merit, but by God's mercy. Finally, he has put on the armor of righteousness, and the helmet of salvation, and the garments of vengeance, and has wrapped himself in the cloak of zeal. Thus, armed, he has gone forth to battle, to exact vengeance upon his enemies. Without a doubt, this signifies the Jews, who persist in blasphemies, and the Roman army surrounding their enemies. When they are conquered, the Lord is shown to have fought. Paul used this testimony when writing to the Ephesians, and wanting us to put on the armor of Christ, by which we may be able to resist the fiery darts of the devil (Ephesians 6). And this is not found in the Septuagint: He will repay the islands, that is, he means the cities of Judea, which the Roman army devastated. For also above (Chapter 20), the Lord speaks to the inhabitants of the island, that is, to Jerusalem, through the Prophet. — Commentary on Isaiah Theodoret of Cyrus : For the unjust deeds displeased the just judge so he did not call the workers of these deeds "humans," for although being in an honored place they do not understand and are comparable to the unthinking beasts and resemble them.… In place of "mercy" the three translators have rendered "justice," so as to say "he has exacted a just recompense on them." It calls the operation of God his "arm," while "mercy" teaches the usefulness of discipline. The God of all things disciplines for profit. — COMMENTARY ON Isaiah 18:59.16