That’s a great chapter. Paul is saying that Israel has lost sight of God’s righteousness. They were still living by the book of the law, under the administration of Levites. They were an example of works without faith. After the exodus: Moses went up Mt Sinai for 40 days while Israel stayed in the wilderness below. They broke their new covenant with God by erecting a golden calf and sacrificing to it (Exodus 32). The penalty of this broken covenant was death, but because of Moses’ pleading, they were spared, and placed under the book of the law. It stood as a witness against Israel until one would come to pay the death penalty. Jesus had to go to the same wilderness and get tempted for 40 days, just like Israel did (where they failed). Jesus righted the wrongs of Israel, paid the death penalty, and used his blood upon the alter for atonement. He ended the Levitical law curse, and allowed a new covenant to begin, essentially replacing the first covenant, but with a new Israel. The book of the covenant (10 commandments etc) is still binding. Those who call themselves Christians (actual Israel) that don’t keep all of God’s commandments are falling into the same sins that the first Israel did. The first Israel was promised a land in exchange for willing obedience to God. True Israel is given the same offer, albeit our promised land will be Heaven and everlasting life. Just like those that broke the covenant didn’t get to see their promised land: so will it be for true Israel should we break our covenant.