How do we know Christ's sacrifice was sufficient?

The sufficiency of Christ's sacrifice is affirmed in Scripture through the principle that redemption requires a complete payment. Hebrews 9:12 emphasizes that Christ entered the Holy Place once for all, obtaining eternal redemption through His own blood. Unlike the sacrifices of the Old Testament, which required repetition and could not satisfy God's justice, Christ's sacrifice was the ultimate fulfillment of the law and fully satisfied divine justice. The doctrine of eternal redemption, therefore, assures believers that they are not merely placed on layaway, but fully and freely saved from sin’s penalty, assured by the perfect work of Christ at Calvary. The redeemed acknowledge this truth, celebrating it with gratitude and praise, as shown in Psalm 107.