How do we know that Christ's payment for sin is sufficient?

Only the perfect and sinless sacrifice of Jesus can fully satisfy God's law and justice. Hebrews 10:10 explains that through the offering of the body of Jesus Christ, we are sanctified once for all. Unlike the repeated sacrifices of the Old Testament, which could never take away sin, Christ’s single sacrifice effectively removes the guilt of sin for those who believe. This completes the work needed for our redemption, establishing that anyone who rests their faith in Him is entirely forgiven.