How do we know that Christ's righteousness is sufficient for salvation?

The sufficiency of Christ's righteousness for salvation is a key tenet of Reformed theology. In 2 Corinthians 5:21, the Apostle Paul writes, 'For our sake he made him to be sin who knew no sin, so that in him we might become the righteousness of God.' This profound exchange occurs at the heart of the Gospel, where Christ takes upon Himself the sins of His people and, in turn, imparts His perfect righteousness to them. This is not merely imputed righteousness but also includes the transformative work of the Holy Spirit that helps believers to grow in holiness. It reinforces the concept that salvation is by grace alone through faith alone, rooted in Christ alone, as stated in the doctrine of justification by faith. Thus, it is through faith in His finished work that we stand justified before God, secure in the knowledge that His righteousness fully satisfies divine justice.