All Israel Saved

According to this passage, all the nation of Israel must be saved. To be a Jew, under the old covenant, you must be circumcised and keep the law. Under the new covenant, you must be rooted in Christ. This truth is there for both the Jew and the Gentile: you must believe in Christ. Because of faith, we are grafted in, because of unbelief, some are cut off. If you are grafted in, don't be full of pride--it's all because of grace.