How do we know righteousness in Christ is true?

Biblical righteousness is not based on our efforts but is found in Christ alone. Romans 3:22 states that the righteousness of God is available through faith in Jesus Christ. Our own attempts at righteousness are insufficient, as seen in Isaiah 64:6, which describes our righteousness as filthy rags. In contrast, Christ's righteousness is perfect and acceptable before God. In Philippians 3:9, Paul emphasizes that we should be found in Him, having a righteousness that comes from God through faith, highlighting the significance of Christ's righteousness as our source of justification.