How do we know that Christ's salvation is just?

The justice of Christ's salvation is foundational to Reformed theology. The critical question arises: how can a holy God display mercy to sinners? The answer lies in the perfect sacrifice of Jesus Christ, who bore the sins of God’s elect. His death served as a substitute, satisfying the demands of justice on behalf of sinners. When God judges sin in Christ, it is a right verdict that allows Him to extend mercy to believers, declaring them not guilty because their sin has been fully paid. This justice ensures that God's acceptance of the believer is not arbitrary but grounded in the truth of Christ’s finished work.