The second subject is tanqīḥ of the five sciences: clarifying, organizing, and delimiting the major fields of Qur’anic teaching. Refinement resolves conceptual overlap without presenting the classifications as alien additions imposed upon the text.
The sciences remain interconnected. A legal verse may recall divine favor; a historical narrative may also underscore monotheism and the final judgment. Categories therefore aid recognition of themes rather than forcing every verse into a completely isolated compartment.
Practical benefit: the reader learns to distinguish a passage’s primary purpose from secondary reminders and supporting arguments.