Everything and almost every one changes by elapse of time. A poet and a writer change their mind and change their style. A diplomat frequently changes his political views and ideas. In one single book we may find variations of style, eloquency, and ideas, and even in choice of words.

      Even on those books which are written about a single subject such as pure science, history or story, we may find a lot of contradictions and discrepancies.

      QURÄN has been revealed in a period of 23 years, and with wide variety of subjects, in various times, and in different circumstances. It is addressed to all sorts of people, and to all grades of mankind. Mohammad (AS) who promulgated QURÄN, was not a learned or scholar! He even could not read and write! And yet there is an amazing unity in his book! Unity of form and style. Unity of inside and outside. unity in beginning and end. There is no contradiction or logical incompatibility between its verses. Nothing in it asserts the contrary of something else! No sentence or phrase is less eloquent than the standard of eloquency that has been observed throughout the Book. You can't find two statements to contradict each other. The Book is an everlasting miracle:

      ``Do they not ponder on the QURÄN? If it was from other than Allah, they would find in it so many contradiction.''

      The following important matters can be deduced from the above verse:

      1- The verse orders people to ponder over the Book, which implies that, it is easy for common people to learn, study, and understand QURÄN

      2- Some of the verses of the Book may explain some others.

      3- QURÄN will never be abrogated or nullified, and changes has no ground in it.