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

The completeness of Christ's salvation is evidenced in His declaration to the leper who returned to worship Him: 'Thy faith hath made thee whole' (Luke 17:19). This response highlights that true wholeness comes not merely from physical healing but from a holistic transformation brought about by faith in Christ. The faith that Christ speaks of is a trust in Him as the sole source of forgiveness and restoration. It signifies acknowledging one's need for divine intervention and recognizing that the law cannot offer salvation. Instead, it is through Christ’s redemptive work — His life, death, and resurrection — that believers receive a new heart and are made fully alive in Him. The contrast between the one who returned and the nine who did not emphasizes that wholeness involves a profound relationship with Christ and a response of gratitude and worship.