How do we know that God is just in saving sinners?

God's justice is a central theme in understanding salvation within Reformed theology. The soul that sins must die, highlighting God's absolute justice and zero tolerance for sin. However, through the death of Christ, who bore the sins of His people, God's justice is not violated; it is satisfied. When Christ was sacrificed, He took on the penalty for sin, ensuring that believers are justly forgiven rather than merely overlooked. This means that in Christ's finished work, God's justice and mercy meet, providing a firm foundation for belief in His salvific grace.