How do we know that salvation is only by God's grace?

The doctrine of salvation by grace alone is rooted in biblical truth. Ephesians 2:8-9 clarifies that it is by grace alone that we are saved, not by works, so that no one can boast. The sermon draws from the narrative in Judges, illustrating that just as Jephthah accomplished the victory over the Ammonites through God’s power, Christ achieved our salvation through His perfect sacrifice. Our inability to uphold the law and the necessity of Christ to bear our sins further reinforces that salvation is a divine gift, not an earned right. Any attempt to credit ourselves with merit undermines God's sovereignty and grace. Thus, believers recognize that salvation and glory belong to God alone.