What is the significance of believing in Christ's righteousness?

Understanding the significance of Christ’s righteousness is central to Reformed theology and the believer’s justification. Paul emphasizes that we are not to rely on our righteousness, which he refers to as 'filthy rags' (Isaiah 64:6), but rather on the perfect righteousness of Christ that is imputed to us through faith. This doctrine assures us that on the day of judgment, we stand not in our own merit but in the accomplished work of Jesus Christ—His life, death, and resurrection which secure our acceptance before God. This belief provides comfort and certainty, as it underlines that our standing with God relies entirely on Christ's obedience and grace.