Paul sets the diagnostic plainly: Israel's failure is not lack of zeal but lack of knowledge — specifically, ignorance of Jehovah's own righteousness, which leads them to construct a substitute righteousness through law-keeping rather than receive the one already accomplished. Christ is named as the telos of the law, its completion and endpoint for all who covenant through faith. The confession pattern Paul cites — calling on the name of the Lord — is the covenant act, and it belongs equally to Jew and Gentile without distinction. The chain of sending, preaching, hearing, and believing defines the Holy Order's messenger function. Isaiah's twin citations close the chapter: Jehovah found by those who did not seek, while Israel remained a disobedient and gainsaying people.