How do we know Christ's righteousness is all we need?

Throughout the sermon, it is emphasized that Christ's righteousness is sufficient for our salvation, as illustrated in Ephesians 5:30 where believers are referred to as members of Christ's body. The idea that we cannot mix our works with Christ's righteousness is foundational in Reformed theology. If righteousness could be achieved through works, then Christ's death would be in vain (Galatians 2:21). Thus, believers must rely entirely upon the imputed righteousness of Christ to be justified before God. Any attempt to mix self-righteousness with faith in Christ ultimately undermines the grace of God.