When the Scripture says: I am the Lord God, the Holy One of Israel, who showed forth Israel your king, will ye not understand in truth Christ the everlasting King? Moreover you are aware that Jacob, the son of Isaac, was never king. And therefore the Scripture, when again explaining to us whom it calls king by the name of Jacob and Israel, said thus:
Jacob is My servant, I will help him: and Israel is My chosen, My soul shall receive him. I have set my spirit upon him, and he shall bring forth judgement to the Gentiles. He shall not cry, neither shall his voice be heard without. A bruised reed he shall not crush, and smoking flax he shall not quench; until he brings out victory, he shall take up judgement, and he shall not be broken, until he set judgement on the earth. And on his name shall Gentiles hope.
Do then they who are of the Gentiles hope on the patriarch Jacob, and not on Christ, and do you yourselves? As therefore he calls Christ Israel and Jacob, so also we, quarried from the bowels of Christ, are the true race of Israel.
But let us pay heed rather to the spoken word itself.
And I will lead out, it says, the seed that is from Jacob and from Judah; and it shall inherit My holy mountain, and My chosen ones and my servants shall inherit it, and shall dwell there. And there shall be in the forest folds of sheep, and the valley of Achor shall be to My people who have sought Me a resting place for their herds. But as for you, who forsake Me and forget My holy mountain, and prepare a table for the demons, and fill mixed wine for the demons — I will deliver you unto the sword. Ye all shall fall in slaughter, because I called you and ye obeyed not; I spake and ye disobeyed; and ye did that which is evil before Me, and chose what I willed not.Isaiah 65:9-12
These then are the words of Scripture. But you yourselves perceive that this seed of Jacob which is here spoken of is of another kind, for none of you would suppose it was spoken about your people. For it is not granted that they who are of the seed of Jacob can leave a right of entrance to them that are born of Jacob, nor that He, when upbraiding the people as being unworthy of the inheritance, should again promise it to them, as though He received them.
But even as the prophet says there: And now, thou house of Israel, come and let us walk in the light of the Lord. For He has dismissed His people, the house of Jacob; because their place was filled, as at the first, with soothsayings and divinations. So also here must we perceive two seeds of Judah, and two races, as two houses of Jacob, the one born of flesh and blood, and the other of faith and spirit.