The sermon centers on the foundational doctrine of justification by faith alone, illustrated through Abraham's experience in Genesis 15, where God declares him righteous not through works but through faith. It emphasizes that God, as the covenantal Lord, is both the comforter, protector, and rewarder, revealing His grace through personal, relational promises that transcend human effort. The passage underscores that faith is not a human achievement but a divine gift, enabling believers to trust in God's promises and receive imputed righteousness—alien to them yet credited by God's decree. Drawing from Paul's teachings in Romans and Galatians, the sermon affirms that justification is a passive, declarative act of God's grace, not contingent on human performance, and applies this truth to the believer's life through assurance of divine protection, confidence in Christ's righteousness, and hope in eternal glory, contrasting the terror of the law with the peace of the gospel.