How do we know that Jesus' sacrifice is sufficient for sin?

The sufficiency of Jesus' sacrifice stems from His unique nature as both God and man, allowing Him to act as the perfect mediator. The Scriptures affirm that He is the Lamb of God, who takes away the sin of the world. In verses like Hebrews 9:26, we see that He put away sin by the sacrifice of Himself, confirming that His atonement was complete and sufficient for all whom He represents. His death was planned by God and fulfilled all righteousness, ensuring that those for whom He died will be justified and accepted by God.