How do we know God's plan of salvation through Christ is true?

The truth of God's plan of salvation through Christ is underscored by the prophetic nature of the Old Testament scriptures that speak to Christ's sufferings and glorification. For instance, Psalm 91 points directly to His divine protection and His role as the suffering servant foretold in Isaiah 53. The culmination of these prophecies is realized in the New Testament, particularly in the resurrection of Christ, which serves as God's definitive confirmation of His plan. The Apostle Paul in Romans demonstrates how Christ's resurrection is a cornerstone of our faith, ensuring our justification and hope.

Moreover, the consistent theme throughout scripture reflects God's sovereign will in choosing Christ as the mediator for His people, affirming the Reformed understanding of salvation as purely rooted in God's grace. The specific prophecies fulfilled in Christ, alongside His works, including His crucifixion and resurrection, substantiate that God's redemptive plan is not an abstract concept, but rather a historical and theological reality known through divine revelation.