How does the Bible as a whole fit together? The events recorded in the Bible took place over a span of thousands of years and in several different cultural settings. What is their unifying thread?
One unifying thread in the Bible is its divine authorship. Every book of the Bible is God’s word. The events recorded in the Bible are there because God wanted them recorded, and he had them recorded with his people and their instruction in mind: "For whatever was written in former days was written for our instruction, that through endurance and through the encouragement of the Scriptures we might have hope" (Rom. 15:4).
The Bible also makes it clear that God has a unified plan for all of history. His ultimate purpose, "a plan for the fullness of time," is "to unite all things in him [Christ], things in heaven and things on earth" (Eph. 1:10), "to the praise of his glory" (Eph. 1:12). God had this plan even from the beginning: "remember the former things of old; for I am God, and there is no other; I am God, and there is none like me, declaring the end from the beginning and from ancient times things not yet done, saying, ‘My counsel shall stand, and I will accomplish all my purpose’ " (Isa. 46:9–10). "When the fullness of time had come," when the moment was appropriate in God’s plan, "God sent forth his Son, born of woman, born under the law, to redeem those who were under the law" (Gal. 4:4–5).
The work of Christ on earth, and especially his crucifixion and resurrection, is the climax of history; it is the great turning point at which God actually accomplished the salvation toward which history had been moving throughout the OT. The present era looks back on Christ’s completed work but also looks forward to the consummation of his work when Christ will come again and when there will appear "new heavens and a new earth in which righteousness dwells" (2 Pet. 3:13; see Rev. 21:1–22:5).
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