How do we know Christ's work of redemption is complete?

The completeness of Christ's redemptive work is confirmed by His declaration on the cross, 'It is finished' (John 19:30). This signifies that all the requirements of the law were satisfied in His sacrificial death. Additionally, Hebrews 9:12 asserts that He obtained eternal redemption for us through His own blood. Unlike the animal sacrifices of the Old Testament, which were temporary and had to be repeated, Christ's sacrifice was once for all, ensuring everlasting salvation for those He represented. His resurrection further affirms the victory over sin and death, demonstrating that His work is not merely sufficient but effective for securing eternal life for His people.