Illustrated Dictionary of the Bible
authority of the Bible is implied by its title, "the Word of GOD".
It is the written record of the Word of GOD which came to prophets,
apostles, and other spokesmen, and which "became flesh" in Jesus
Christ. Christians believe Jesus Christ was the Word of GOD in a
unique sense. Through Jesus, GOD communicated the perfect revelation
of Himself to mankind. For Christians the authority of the Bible is
related to the authority of Christ. The Old Testament was the Bible
that Jesus used - the authority to which He made constant appeal and
whose teachings He accepted and followed. When Jesus was arrested in
the Garden of Gethsemane and led away to His execution, He submitted
with the words, "The Scriptures must be fulfilled" (Mark 14:49). He
saw His mission in the world as a fulfillment of the predictions of
the Old Testament.
The New Testament presents the record of Jesus' life, teachings, death, and resurrection; a narrative of the beginning of the Christian church with the coming of the Holy Spirit; and the story of the extension of the gospel and the planting of the church during the following generation. It also contains the written teachings of Jesus' apostles and other early Christians who applied the principles of His teaching and redemptive work to their lives.
Taken from: the "Illustrated Dictionary of the Bible" by Herbert Lockyer, Sr., Editor with F. F. Bruce and R. K. Harrison, published by Thomas Nelson Publishers in 1986.