How do we know works cannot save us?

The doctrine of salvation by grace alone is foundational in Reformed theology. Scriptures like Ephesians 2:8-9 emphasize that we are saved by grace through faith, not of works, lest anyone should boast. In Matthew 7:22, those who claimed to perform many works in Jesus' name are told, 'I never knew you,' indicating that their reliance on their own efforts was misplaced. True salvation does not stem from human merit but is a gift of God. As Paul articulates in Romans 4, Abraham was justified not by his works, but by his faith, exemplifying that our justification depends solely on Christ's righteousness.