Paul's explanation of Israel's failure emphasizes their pursuit of righteousness through law-keeping rather than faith in God's provision through Christ. His declaration that Christ is the end of the law for righteousness means not abolition but fulfillment, making righteousness available through faith rather than works. The beautiful passage about preaching—how can they believe without hearing, and how can they hear without someone preaching—demonstrates the necessity of gospel proclamation while Israel's continued unbelief fulfills Old Testament predictions.