Why does Christ’s blood have the power to save?

The power of Christ's blood lies in its sufficiency as the perfect sacrifice for sin. As the Lamb of God, He was offered once for all to satisfy God's justice, something that animal sacrifices could never accomplish. Hebrews 9 emphasizes that His own blood obtained eternal redemption for His people. This unique ability to save underscores the fullness of His work at the cross, confirming that through His sacrifice, He achieved salvation for everyone for whom He died. The declaration 'It is finished' at Calvary proclaims the completeness of His atoning work.