How do we know Jesus' sacrifice fulfills God's redemptive plan?

Jesus' statement 'It is finished' (John 19:30) marks the culmination of God's redemptive plan, which was fully orchestrated before the foundation of the world. Throughout scripture, particularly in the Old Testament, prophecies concerning the Messiah's suffering and exaltation align perfectly with Jesus' life and death. For example, references to Him being the Lamb of God (1 Peter 1:19) and prophecies that He would be lifted up (John 3:14) reinforce that all was completed according to God's decree. This fulfillment not only shows Jesus as the Messiah but also confirms the sovereignty of God in orchestrating salvation for His people, providing assurance that redemption is secured in Christ.