Reasons for the Insufficiency of the Theory of Topical Unity of the Quran's Chapters

In the previous article titled "Topical Unity of the Verses of the Quran in the Balance of Criticism" (see: Quranic Research Quarterly, No. 54-55, p. 206), the weakness of the reasons for this theory was explained in detail. It can be added that besides the weakness of the reasons presented, there are other reasons and evidences that prove that attempts to maintain a single topic for all the chapters of the Quran is impossible. Among the reasons and evidences provided in this article are: the incompatibility of this theory with the style governing the Quran; lack of a reliable and comprehensive touchstone; difficulty of attaining a single inner purpose; lack reference to the Infallible Imams; comparison of the Quran with the current scientific books on the two fields of content and style; gradual Revelation of the verses of the Quran; the hazard of interpretation by personal opinion; and, diversity of views by the advocates of topical unity theory in determining the main inner purpose of the chapters.