How do we know that Jesus is the fulfillment of God's promises?

The entirety of Scripture points to Christ as the fulfillment of God's promises. John’s testimony in 1 John 1:1 underscores His incarnation: 'the Word of life' was manifest among humanity, emphasizing the continuity between the promise of a Messiah and its realization in Jesus. Prophecies regarding His coming, such as Isaiah 7:14 announcing His virgin birth, validate that Jesus is indeed the awaited Savior. The historical accounts of His works and teachings, along with His sacrificial death and resurrection, serve as evidence of God's faithful promise-keeping throughout the ages.