How do we know that Christ’s atonement is effective for His sheep?

The efficacy of Christ’s atonement for His people is rooted in the concept of election and the specific nature of His sacrifice. Psalm 22 portrays the suffering of Christ on the cross, which establishes the foundation for the promise found in Psalm 23. His death is an effectual propitiation for the sins of those whom the Father has given Him. Scripture states that 'all that the Father giveth me shall come to me,' ensuring that His sacrifice secures the salvation of the elect. This is emphasized in verses such as Hebrews 10:14, which states, 'For by one offering He hath perfected forever them that are sanctified,' demonstrating that His atonement addresses the sins of His people and effectively brings them to restoration.