How do we know Christ's finished work is sufficient for salvation?

The sufficiency of Christ's finished work is thoroughly explained in Scripture. In Romans 3:24-26, we learn that God justifies the ungodly through faith in Christ, showing His righteousness at the cross. This entails that all sins have been dealt with completely, not just overlooked but fully satisfied. The concept of justification relies on Christ’s sacrificial death and resurrection, affirming that He paid the penalty for every sin when He declared, 'It is finished' (John 19:30). Moreover, Hebrews 10:14 emphasizes that by one sacrifice, He has made perfect forever those who are being made holy. Hence, believers can fully trust that Christ's sacrifice is not just adequate but absolutely complete, ensuring their total redemption and reconciliation with God.