How do we know that redemption in Christ is accomplished?

The accomplishment of redemption is rooted in the person and work of Jesus Christ, who bore the sins of the elect and satisfied the justice of God (Isaiah 53:10-11). His sacrifice was not only decreed but also executed, leading to the justification of many. While His redemptive work is complete in the sense that He has paid the price, the full realization of redemption awaits the future return of Christ, when He will claim that which has been purchased, completing the process of salvation (Romans 5:8-9).