How do we know that salvation is finished?

The assurance that salvation is finished comes from the biblical testimony that Christ is the fulfillment of the law and that His sacrifice was sufficient. Romans 10:4 declares that Christ is the end of the law for righteousness to everyone who believes, thus confirming that believers do not need to complete any further works to secure their salvation. Hebrews 10 highlights that Jesus offered one sacrifice for sins forever and then sat down, signifying that the work of atonement is fully accomplished. Since Christ took upon Himself the sins of the world and bore the penalty in our place, our salvation is not contingent upon our performance but is solely based on His completed work.