How do we know that Christ's atonement was sufficient?

The sufficiency of Christ's atonement is grounded in the nature of his sacrifice. Jesus, being both God and man, was the only one capable of bearing the infinite wrath of God against sin. His death on the cross was not merely a tragic event; it was a victorious fulfillment of God’s redemptive plan. Hebrews 10:12 asserts that after offering one sacrifice for sins, he sat down at the right hand of God, signifying that the payment for sin was complete and there is no need for further sacrifices. Additionally, the Old Testament sacrificial system only temporarily covered sin, while Christ's sacrifice removes it entirely, as stated in John 1:29 where John the Baptist calls him the Lamb of God who takes away the sin of the world.