Paul's warning against Gentile arrogance toward Israel uses the olive tree metaphor to show how Gentiles are grafted into covenant privileges rather than replacing Israel entirely. His teaching about Israel's partial hardening until the fullness of the Gentiles comes in reveals God's plan to save both peoples while maintaining faithfulness to His covenant promises. The doxology praising God's unsearchable judgments and inscrutable ways appropriately concludes this section by acknowledging the limits of human understanding regarding divine sovereignty and election.