Here is a simple diagram that shows the basic divisions of the Bible:

THE BIBLE

UNITY OF THE BIBLE

When we speak of the unity of the Bible, we mean two things:

ONE: THE BIBLE IS UNITED IN CONTENT:

Even though the Bible was written by many writers over many years, there are no contradictions. One author does not contradict any of the others. The Bible includes discussion of hundreds of controversial subjects. (A controversial subject is one that creates different opinions when mentioned). Yet the writers of the Bible spoke on such subjects with harmony from the first book of Genesis through the last book of Revelation. This was possible because there was really only one author: God. The writers only recorded the message under His direction and inspiration. For this reason, the content of the Bible is united.

TWO: THE BIBLE IS UNITED IN THEME:

Some people think the Bible is a collection of 66 separate books on different subjects. They do not realize that the Bible is united by a major theme. From beginning to end, the Bible reveals God's special purpose which is summarized in the book of Ephesians:

Having made known unto us the mystery of His will, according to His good pleasure which He hath purposed in Himself:

That in the dispensation of the fullness of times He might gather together in one all things in Christ, both which are in heaven, and which are on earth; even in Him:

In whom also we have obtained an inheritance, being predestinated according to the purpose of Him who worketh all things after the counsel of His own will. (Ephesians 1:9-11)

The Bible reveals the mystery of God’s plan which is the unifying theme of the Bible. It is the revelation of Jesus Christ as the Savior of sinful mankind. Jesus explained how the Old Testament centered on Him: