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

The completeness of Christ's salvation is encapsulated in His declaration from the cross, 'It is finished' (John 19:30). This statement signifies that He accomplished all that was needed for the salvation of His people, fulfilling the law's requirements and satisfying God's justice. Hebrews 10:12 states, 'But this man, after he had offered one sacrifice for sins forever, sat down on the right hand of God,' indicating that His work is finished and He possesses eternal redemption for all who believe. Thus, we trust that Christ's atoning sacrifice was not merely a possibility but a definitive and complete action for His elect.