How do we know salvation through Christ is complete?

The completeness of salvation can be affirmed through the words of Jesus on the cross: 'It is finished' (John 19:30). This declaration signifies that all necessary payment for sin has been made by Christ as our perfect high priest. His sacrifice was not only adequate but perfect, as it met the demands of divine justice fully. The New Testament assures us that through faith in him, our sins are forgiven, and we are reconciled to God without the need for any additional works. Therefore, our salvation is based entirely on Christ's completed work and not on our merits.