Why is it important for Christians to understand the finished work of Christ?

The finished work of Christ is crucial for Christians as it signifies that all that was necessary for salvation has been accomplished. In John 19:30, Jesus' cry of 'It is finished' emphasizes that there is nothing more to be done for redemption. This assurance provides believers with peace and confidence, knowing that their sins are fully paid and they are accepted by God. Historic Reformed theology teaches that salvation is entirely by grace through faith in Christ's completed work, which instills hope in believers and encourages them to rely solely on His righteousness rather than their own efforts.