How do we know that God forgives sin?

The assurance of God's forgiveness is profoundly established in scripture, particularly through His promises and the redemptive work of Christ. In Isaiah 43:25, God explicitly states His intent to forgive transgressions for His own sake. This is further confirmed in the New Testament where we see the fulfillment of God's redemptive plan through Jesus Christ, whose death on the cross addresses the penalty of sin (Romans 5:8). Importantly, the nature of God's forgiveness is not merely to overlook sin but to satisfy the requirements of His justice, ensuring that the law is fulfilled through Christ's atonement. Hence, believers can have confidence in their forgiveness as they rest in the completed work of Christ, which fully addresses their guilt before God.