Jerome : (Verses 8-9) And He said: Yet My people are; sons not denying: and He became a Savior unto them. In all their affliction He was not afflicted, and the Angel of His presence saved them: in His love and in His pity He redeemed them, and He bore them, and carried them all the days of the age. 70: And he said: Not my people, the children will never reject. And he became for them salvation from all their tribulation: not a messenger, nor an angel, but he himself saved them because he loved them, and spared them, he himself redeemed them, and received them, and exalted them all the days of the world. Where we have interpreted: In all their tribulation he was not troubled, which in Hebrew is said Lo, and is a denying adverb, for not, it can also be read itself, so that the meaning is: In all their tribulation he himself is troubled, that is, God: so that he himself might bear not only our sins, but also our tribulations. For he himself carries our weaknesses, and he suffers for us. Moreover, the Seventy put another thing that is not found in Hebrew, not an envoy, nor an angel, but he himself saved them: of which we will speak in its proper place. Therefore God, who is a just judge to the house of Israel, and mitigates the severity of justice with mercy in judging: Indeed, I have begotten sons and exalted them, and they have despised me. However, because they are my people, and once named sons, they will not perish forever; if they stop rejecting and denying me, they will recognize the Savior: because he himself was troubled in all their tribulations. Whether he was not troubled, so that he could temporarily abandon them and force them, stripped of his help, to plead. Indeed, He did not afflict them, but on the contrary, while others pursued them, He was their helper and sent His Angel to deliver them from danger. Or according to the Septuagint, He did not want to save His people through angels and prophets and other holy men; rather, He himself descended to the lost sheep of the house of Israel to carry the sick sheep on His shoulders and to find the lost coin, and joyfully welcome the prodigal son upon his return. For this reason, the Bride says in the Song of Songs: Let him kiss me with the kisses of his mouth. Not through the patriarchs, Moses, and the prophets, but let him take my body, let him dwell in my flesh, let the Word become flesh, and thus let him kiss me dwelling in me, so that he may be Emmanuel. Therefore, not as a messenger, nor as an angel, but he himself will save those who have received salvation: not by the merit of works, but by the love of God. For God so loved the world that he gave his only Son, so that everyone who believes in him should not perish but have eternal life. — Commentary on Isaiah