How do we know that salvation is through grace and not works?

Historic Reformed theology affirms that salvation is entirely a work of God’s grace and not dependent upon human efforts or good deeds. Ephesians 2:8-9 emphasizes that we are saved by grace through faith, a gift from God, not a result of works so that no one may boast. The distinction is vital; while good works may be a fruit of genuine faith, they do not contribute to one's justification before God. The completed work of Christ is the sole basis for our salvation, showcasing God's sovereign grace at work.