How do we know that God's promises are fulfilled in Christ?

In Galatians 3:16, Paul clarifies that the promises made to Abraham were directed to his singular 'seed,' which is Christ. This establishes a clear link between the Old Testament promises and their New Testament fulfillment in Jesus. The promises made to Israel regarding blessings, inheritance, and unconditional love find their ultimate realization in Christ, who mediates a new covenant based on grace. Throughout scripture, from Genesis to Revelation, God's faithfulness in keeping His word is manifest in the life, death, and resurrection of Jesus. As such, the church, made up of all who believe, inherits these promises and stands as the fulfillment of God's redemptive work.