How do we know Christ's sacrifice truly removes sin?

The distinction between the Old Testament animal sacrifices and Christ's sacrifice lies in the effect of atonement. In the Old Testament, sacrifices merely covered sin. However, Christ's atoning work is definitive; He does not cover sin but removes it entirely. John the Baptist declared Christ as the Lamb of God who takes away the sin of the world (John 1:29). This is foundational for believers, as it assures us that our sins are not just hidden but genuinely expunged by His blood, which brings true reconciliation with God and the promise of eternal life.