How do we know Christ's sacrifice is sufficient for sins?

The sufficiency of Christ's sacrifice is affirmed in Hebrews 9:26, where it states that He appeared to put away sin by the sacrifice of Himself. Unlike the repeated sacrifices of the Old Covenant, Christ's offering was once and for all, directly dealing with sin. This act of substitution satisfies divine justice, as He bore the sins of many, meaning His sacrifice covered the debt owed to God, allowing believers to be justified. The fact that He does not need to offer Himself again (Hebrews 10:11-14) ensures us that His work is complete and definitive, leading to our salvation and the forgiveness of our sins.