The Ingrafting of the Gentiles, Part 1

"You will be greatly hindered in understanding this argument, except you take notice, that the Apostle speaks sometimes of the whole nation of the Jews, and sometimes of single individuals; for hence arises the diversity, that one while he speaks of the Jews as being banished from the kingdom of God, cut off from the tree and precipitated by God's judgment into destruction, and that at another he denies that they had fallen from grace, but that on the contrary they continued in the possession of the covenant, and had a place in the Church of God. It is then in conformity with this difference that he now speaks; for since the Jews for the most part rejected Christ, so that perverseness had taken hold almost on the whole nation, and few among them seemed to be of a sane mind, he asks the question, whether the Jewish nation had so stumbled at Christ, that it was all over with them universally, and that no hope of repentance remained…. That we are so to understand his meaning is evident from this, — that having before connected a sure ruin with blindness, he now gives a hope of rising again; which two things are wholly different. They then, who perversely stumbled at Christ, fell and fell into destruction; yet the nation itself had not fallen, so that he who is a Jew must necessarily perish or be alienated from God." – John Calvin