Why is the righteousness of Christ essential for salvation?

The doctrine of justification by faith is central to Reformed theology, as demonstrated in Romans 3:22-24, which states that righteousness is through faith in Jesus Christ for all who believe. Our own righteousness is insufficient, as Isaiah 64:6 indicates that our best works are like filthy rags. Christ's righteousness, which is imputed to us, is vital because it fulfills God's requirement for holiness. By being united with Christ through faith, believers can stand justified before God, clothed in His righteousness. It is through this divine exchange—that Jesus took on our sin and we receive His righteousness—that we are saved.