How do we know that salvation is completely by grace?

The doctrine of salvation by grace alone is rooted in Scripture, particularly highlighted in Psalm 37, where it is stated, 'the salvation of the righteous is of the Lord' (Psalm 37:39). This emphasizes that salvation is not earned through our deeds but is a gift from God. The Apostle Paul reinforces this in Ephesians 2:8-9, declaring that we are saved by grace through faith, not of ourselves, lest anyone should boast. This central truth of God's sovereign grace assures believers that their standing before God rests entirely on Christ's redemptive work, eliminating any reliance on personal merit.