How do we know that salvation is through God's grace alone?

The doctrine of salvation by grace alone is rooted in God's covenant of grace, as articulated in the sermon. This covenant is not based on human effort or merit; rather, it is entirely dependent on the finished work of Christ, who fulfills all righteousness and makes atonement for sin. In contrast to the covenant of works, which suggests that human actions can influence salvation, the covenant of grace assures believers that their salvation is secure and complete in Christ alone. Thus, the certainty of salvation rests on God's promise rather than individual performance, reflecting the principles of sovereign grace theology.