The Quran is the unique book, unlike any other book in the whole world. The Quran is not a book on "religion" in the sense this word is generally understood. That is why when a reader approaches the Quran with the common notions of a book in mind, he is puzzled by its style and manner of presentation. The revelation of the Quran continued for twenty-three years. The different portions of the Quran were revealed according to the requirements of the various phases of Islam. It is thus obvious that such a book cannot have the kind of uniformity of style which is followed in formal books on religion and the like.
