How do we know that Christ's atonement is complete?

The completeness of Christ's atonement is a foundational truth of the Christian faith. According to Isaiah 53:10-11, it pleased the Lord to bruise Him, and by His sacrifice, He justifies many, indicating that the work of atonement is fully effective. In His prayer in John 17, Jesus declares that He has finished the work the Father gave Him to do, highlighting the sufficiency of His sacrifice. This truth is also reflected in Romans 3:24-26, where we see that we are justified freely by God's grace through the redemption that is in Christ Jesus. Emphasizing that Christ bore our sins and fully met the righteous requirements of the Law, we can be assured that nothing more is needed for our salvation — it is finished.