How do we know that Christ's forgiveness is true?

The truth of Christ's forgiveness is assured by His immutable nature; Hebrews 13:8 reminds us that 'Jesus Christ is the same yesterday, today, and forever.' Since God's character does not change, neither does His disposition to forgive. The forgiveness given through Christ is founded on the justice satisfied by His death on the cross, meaning that our sins have been adequately atoned for. It assures believers that they can have confidence in their standing before God, knowing that their sins are truly forgiven because of Christ's completed work.