How do we know that Christ's death accomplished salvation?

The assurance that Christ's death accomplished salvation lies in the theological truth that His sacrifice was the fulfillment of God's plan for redemption. Hebrews 10:14 states that 'by one offering, He hath perfected forever them that are sanctified.' This shows that Christ did not merely make salvation possible; His death secured the eternal redemption of those for whom He died. The ripping of the veil was God's declaration that separation due to sin has been removed, and now, through faith in Christ's atoning work, believers are declared holy and can boldly approach the throne of grace (Hebrews 4:16). Thus, Christ's work is complete, and His sacrifice is sufficient.