How do we know righteousness through faith is true?

Righteousness through faith is not derived from our own efforts but is a gift that comes through Christ's redemptive work. In Philippians 3:9, Paul emphasizes that his righteousness is not of the law but that which comes through faith in Christ. This doctrine is rooted in the belief that salvation is entirely of the Lord’s doing, aligning with the Five Points of Dordrecht, which affirm the necessity of grace and faith in Christ alone for justification. This understanding is echoed in several places throughout Scripture that declare salvation and righteousness are exclusively through faith in Jesus.