Why is the concept of 'finished work' important for Christians?

'It is finished' encapsulates the completeness and sufficiency of Christ's atoning work. This declaration assures believers that all the requirements for sin atonement were met in Jesus’ death, fulfilling the law and satisfying divine justice, as mentioned in Romans 3:25-26. It emphasizes that nothing can be added to Christ’s sacrifice; He finished the work of redemption. This truth brings peace to the believer, ensuring that salvation is a gift fully accomplished by Christ, not dependent on human effort.