What does it mean that salvation is a finished work?

The concept that salvation is a finished work is anchored in the belief that Christ's sacrificial death and resurrection completed the requirements for redemption. As seen in John 19:30, when Jesus proclaimed, 'It is finished,' He affirmed that His work of atonement was complete, eliminating the need for any additional sacrifice or work from believers. This completed work is central to the doctrine of assurance, assuring believers that their salvation is secure in Christ's accomplishment, which leaves no room for human merit. It emphasizes that all that is needed for salvation has been provided in Him, giving believers peace and confidence in their faith.