The sermon centers on the significance of Abraham as a key figure in God's redemptive plan, emphasizing his story as both historical and representative of faith grounded in divine grace. Through an examination of Genesis 15 and the following chapters, we see God's promises to Abraham—of a miraculous heir, a vast posterity, and a covenantal land—were fulfilled not through human effort or legalistic obedience, but through faith alone, as Abraham believed God and that faith was accounted to him for righteousness. The sermon distinguishes between the Abrahamic covenant's national and typological dimensions, arguing that while circumcision marked a physical lineage, true righteousness comes through faith in the coming Messiah, not through works or the Mosaic Law. This promise ultimately points forward to Christ, the true seed of Abraham, who fulfills all that to which the Old Testament points. The message culminates in the Advent truth that salvation is entirely of grace, secured by God's faithfulness, not human merit, and is now accessible through Christ alone.