How do we know that Christ's work on the cross is sufficient?

The sufficiency of Christ's work on the cross is central to the message of the Gospel. In Colossians 2:14, we see that Christ canceled the debt of our sin, and in John 19:30, Jesus proclaimed, 'It is finished,' indicating that His sacrifice was complete and sufficient for our redemption. This means there is nothing left for us to do to earn salvation. Instead, we trust in His finished work, which fully atones for our sins, as affirmed in Romans 8:1: 'There is therefore now no condemnation for those who are in Christ Jesus.' Believers can rest assured in the perfect work of Christ, knowing that through faith in Him, we are redeemed and justified before God.