How do we know that Jesus' death was an accomplishment?

The death of Jesus Christ is described as an accomplishment rather than a setback because it fulfills the divine justice of God's law. According to Galatians 3:13, Christ redeemed us from the curse of the law by becoming a curse for us, fulfilling the law to its fullest demands, including death. He had to die as the perfect substitute for sinners, demonstrating His perfect obedience not only in life but also in willingly accepting death. The accomplishment of His mission results in the complete atonement for all the sins of His people, underscoring the theological significance of the cross as the ultimate victory over sin and death, rather than a defeat.