How do we know that salvation is based on Christ's faithfulness?

The assurance of salvation being reliant on Christ's faithfulness can be seen in passages such as Romans 3:21-22, where Paul asserts that righteousness comes from God through faith in Jesus Christ. This understanding underscores the core of sovereign grace theology, where man's efforts are inadequate. It unequivocally shifts the focus from human agency to Christ, who is the author and finisher of our faith (Hebrews 12:2). Therefore, believers rest in the certainty that salvation is entirely a result of Christ's fulfillment of the law and His perfect trust in the Father.