Nicely summarized by Dr. Robert Plummer of Southern Baptist Theological Seminary in 40 Questions about Interpreting the Bible (Kregel Academic, 2010)
The Bible itself is evidence of one of its main claims—that is, that the God who made the heavens, earth, and sea, and everything in them is a communicator who delights to reveal himself to wayward humans. We read in Hebrews 1:1-2, “In the past God spoke to our forefathers through the prophets at many times and in various ways, but in these last days he has spoken to us by his Son, whom he appointed heir of all things, and through whom he made the universe.”
These verses in Hebrews point to the culmination of biblical revelation in the eternal Son of God. This Son became incarnate in Jesus of Nazareth, forever uniting God and man in one person—100 percent God and 100 percent man (John 1:14). The prophecies, promises, longings, and anticipations under the old covenant find their fulfillment, meaning, and culmination in the life, death, and resurrection of Jesus Christ. As the apostle Paul says in 2 Corinthians 1:20, “For no matter how many promises God has made, they are ‘Yes’ in Christ.”
The purpose of the Bible, then, is “to make [a person] wise for salvation through faith in Christ Jesus” (2 Tim. 3:15). The Bible is not an end in itself. As Jesus said to the religious experts in his day, “You diligently study the Scriptures because you think that by them you possess eternal life. These are the Scriptures that testify about me” (John 5:39). So, under divine superintendence, the goal of the Bible is to bring its readers to receive the forgiveness of God in Christ and thus to possession of eternal life in relationship with the triune God (John 17:3).