How do we know the doctrine of forgiveness is true?

We know the doctrine of forgiveness is true because it is founded on God's infallible Word. The Bible asserts, 'If we confess our sins, he is faithful and just to forgive us' (1 John 1:9). This assurance is further anchored in the redemptive work of Christ, who took upon Himself the sins of His people, satisfying God's justice through His death. When we acknowledge our sinfulness before Him, we trust in His promise of forgiveness, which is given freely to all who believe in Christ. Therefore, our assurance comes from both Scripture and the historical reality of Christ's sacrifice on the cross for our sins.