Augustine of Hippo : What did the prophet Isaiah mean when he announced that a mountain would be prepared on the summits of the mountains, to which all peoples were going to come? The law and the Word of God was going to proceed from Zion and Jerusalem to all nations, not from Mount Sinai to one nation. This we see most evidently fulfilled in Christ and the Christians. A little later the prophet says, "O house of Jacob, come and let us walk in the light of the Lord." Here, you [the Jews] will surely say your usual piece: "We are the house of Jacob," but listen a moment to what follows, and when you have said what you want to say, hear what you do not want to hear. The prophet continues, "For he has cast off his people, the house of Israel." Here say, "We are the house of Israel"; here acknowledge yourselves and forgive us for reminding you of these facts. — IN ANSWER TO THE JEWS 8 Augustine of Hippo : Dearly beloved, whether the Jews receive these divine testimonies with joy or with indignation, nevertheless, when we can, let us proclaim them with great love for the Jews. Let us not proudly glory against the broken branches; let us rather reflect by whose grace it is, and by much mercy, and on what root, we have been grafted into. — IN ANSWER TO THE JEWS 10 Jerome : (Vers. 5, 6.) Come, house of Jacob, and let us walk in the light of the Lord: for you have cast off your people, the house of Jacob. After the calling of the Gentiles, and the manifestation of the mountain of the Lord upon the top of the mountains, to His people, that is, the people of Judah, who is called the house of Jacob, the Prophet turns and exhorts them, so that those who are in the darkness of error may receive the light of truth and walk in the light of the Lord. And he sings in a certain way the words of David: Come to Him and be enlightened, and your faces shall not be confounded (Ps. 33:6). For everyone who does evil hates the light, and does not come to the light, so that their works may not be exposed. But you, O house of Jacob, the people of my nation, come with me, and let us walk together in the light of the Lord. Let us receive the Gospel of Christ, and let us be enlightened by him who says: 'I am the light of the world' (John 8:12). And when he had spoken this to the people of the Jews, seeing their unrepentant hearts and their souls hardened by disbelief, he makes an address to the Lord and says: Therefore, I urge them to come to you and partake of your light with me, because they have forsaken your people, the house of Jacob, due to the deservedness of their sins. — Commentary on Isaiah Justin Martyr : But as there the prophet says, 'And now, O house of Jacob, come and let us walk in the light of the Lord; for He has sent away His people, the house of Jacob, because their land was full, as at the first, of soothsayers and divinations;' even so it is necessary for us here to observe that there are two seeds of Judah, and two races, as there are two houses of Jacob: the one begotten by blood and flesh, the other by faith and the Spirit. — Dialogue with Trypho, Chapter CXXXV