How do we know God's promises to Israel are still relevant?

The Apostle Paul articulates in Romans 9:6 that God's Word has not failed, meaning His promises to Israel are still significant. However, Paul clarifies that true Israel is defined not by mere ethnicity but by God's sovereign choice and spiritual election. The promises are secure because they rest on God's unchanging character and His covenant faithfulness. Therefore, the relevance of the promises lies in their ultimate fulfillment in Christ, who is the true seed of Abraham and the Savior of all who believe, both Jews and Gentiles.