How do we know salvation is only through faith in Christ?

In the sermon, it is clearly articulated that salvation cannot be attained by our own works; it is purely based on Christ's finished work on the cross. The curse of the law is removed because Christ bore the punishment intended for His elect. As seen in Galatians 3:13, He became a curse for us to redeem us and bring blessings. This theological perspective resonates with the doctrine of justification by faith alone, asserting that through Christ alone we receive righteousness and forgiveness.