The very structure of the Hebrew language is based on repetition.  Hebrew poetry is not based on the same principles and rules as other languages.  English poetry generally is based on rhyme and rhythm – Hebrew poetry is based on repeat and enlarge – and it is in this repeat and enlarge process that dominates most of the Bible.  It is an intricate and sophisticated process – each repetition not only contains elements of the original statement (or thought) but it always adds new information.  Most often the first thought will be repeated in a different way by the second thought (the repetition) – the second thought offering additional insight into what is being said, and in some instances even explaining [and defining] what the first thought means. 
The best way to illustrate this structure is to provide some examples.  David crafts his psalms in exactly this manner.  The following are verses 7,10 & 17, from Psalm 51:
First thought:         Purge me with hyssop, and I shall be clean
Second thought:    wash me and I shall be whiter than snow.
First thought:         Create in me a clean heart, O God;
Second thought:    and renew a right spirit within me.
First thought:         The sacrifices of God are a broken spirit:
Second thought:    a broken and contrite heart, O God, thou wilt not despise.
Sometimes a whole verse is used as the first thought and the next verse contains the second thought, as with the following example from Solomon, Prov. 2:3,4:
First thought:  Yea, if thou criest after knowledge,
and liftest up thy voice for understanding;
Second thought: If thou seekest her as silver,
and searchest for her as for hid treasure;
Although extensively used in the Psalms and wisdom literature, it is by no means restricted there.  The same structure is used throughout the Scripture.  Compare Isa.1:18:
First thought:         Come now, let us reason together, saith the Lord: though your sins be as scarlet, they shall be as white as snow;
Second thought:    though they be red like crimson, they shall be as wool.
The prophecies in the Bible are based and built on the same principle of repeat and enlarge.  The Bible is a carefully constructed book. – and why not? – what else should we expect, when we know that it has been inspired by the Holy Spirit.  Broadly speaking the Bible is constructed like a house.  First a solid foundation is laid.  Then the walls are built on top of the foundation.  Lastly, the roof is put on top of the walls.  No builder will start with the roof, before the foundation and the walls are complete.  When it comes to understanding the Bible, many people are beginning with the roof.  Some ignore the foundation completely, others are content to climb only the walls and think they have completed the tour of the building.  The important thing to remember is that the walls hold up the roof, and the walls are held up by the foundation.  Each of them are connected and relying upon the other.  The book of Revelation is the roof, but it cannot be understood in isolation to the walls and the foundation.
Another illustration that we can use is that of the music symphony.  A music symphony is generally composed of several themes that are introduced separately, then they are interwoven together, and then the symphony concludes with a dramatic crescendo.  This is also how the Bible is constructed.  For example, what is the theme of the book of Psalms?  Answer: praise.  But we do not even see the word praise until Psalm number 7.  However, as we near the end of the book the frequency of the word praise increases – praise is repeated and enlarged upon until there is a crescendo of praise in the last Psalms (especially the very last Psalm).   
Bible construction can also be compared to the game of dominos.  Each link in the chain of dominos is connected to the other.  A chain of dominos can be made into a circle – making the end connect to the beginning. The book of Revelation is the end of the beginning – it contains all the themes presented in the Bible.  The Book of Revelation is a repeat and enlargement of the entire Bible – it is the dramatic crescendo of the Biblical Symphony.
And again, Bible construction can be likened to that childhood favorite, the treasure hunt.  The seekers are given cryptic clues, and in order to make correct progress they have to solve each clue.  The interpreting of the clues are governed by principles that even children understand.  As each clue is correctly interpreted, steady progress is made towards the eagerly awaited reward.  We too need to understand the principles of interpretation as we hunt for heavenly treasure.  Perhaps the desire to do so and the success we achieve are in direct proportion to how much we desire the reward.
The best illustration of the principle of repeat and enlarge, used in a prophetic context, is found in the book of Daniel.  Daniel had four main visions.  Each one covers the history of the kingdoms of this world and the history of God’s kingdom, from Daniel’s time, to the end of time.  The first vision, of the statue, is the foundation for all the others.  Each subsequent vision repeats what was previously revealed, and then adds additional information.  For example, after Daniel had his third vision, he said it was similar to his first vision (Dan. 8:1).  When He was about to have his fourth vision the angel said to him that the purpose was to give Daniel “skill and understanding” (Dan. 9:22), about his third vision (Dan. 9:23).  Although not quite as obvious, the book of Revelation is constructed in a similar way to the book of Daniel.  And in addition, it extensively repeats and enlarges on the prophecies found in Daniel, and other parts of the Old Testament. 
The repeat and enlarge principle is one of the most important principles, because it operates like a “spelling checker.”  As one makes progress through the prophecies and as one “spells out” what they think each prophecy means – the repeat and enlarge principle ensures that the interpretation of each prophecy must agree with the one that went before it.  In this way, it operates as a “prophecy proof checker.”  It not only helps us with the correct application, it ensures that our application will harmonize with what has been discovered previously.  The repeat and enlarge principle ensures, that every domino in the chain remains in its correct place.
When one recognizes and accepts the validity of this principle, the Bible can become almost like a new book.  Panoramas and vistas that have not been discerned before are now revealed.  The reading of the Bible is no longer just a surface skim through.  The descent into the mine for the riches awaiting us there can begin.
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More Inputs from Brother Blan Pinto.
More Scriptural Examples of the Repeat and Enlarge can be seen in

Genesis 1:26,27 and in Chapter 2:7.

Revelation 1:7 then 14:14 and 19:11

Mathew 1:1, 16