The Quran presents its use of the Arabic language not as a mere cultural accident, but as a divine proof of its own intelligibility. It claims to be a "Book whose verses are perfected" (Surah 11:1) and "fully detailed" (Surah, 6:114).
However, this creates a devastating internal conflict: If the Quran is the "Perfected Word" in "Clear Arabic" so that man may have no excuse for misunderstanding, the presence of even a single ambiguous (mutashabih) verse or mysterious letter (Muqatta'at) renders its own self-description false.
P1: The Quran claims to be a "detailed explanation of all things" (تفصيل كل شيء) and a "clear Arabic" revelation specifically to facilitate understanding (Surah 12:2, 41:3 16:89).
P2: The Quran admits it contains "ambiguous" verses (mutashabihat) that can lead to discord and are not fully understood (Surah 3:7).
P3: A "fully detailed" explanation cannot, by definition, contain essential components that are "ambiguous" or "hidden" from the audience it was sent to enlighten (Surah 6:114).
C: The Quranic claim to be a "Perfected/Detailed" revelation is logically incompatible with its own admission of ambiguity.
If the Quran contains inherently ambiguous verses (as per 3:7), then the sweeping descriptions of the Quran as a "Clear Book" (5:15) and "easy for remembrance" (54:17) are rhetorical overstatements. If the "Clear Arabic" does not produce clarity for the reader in all its parts, the divine claim to have "clarified" the book (75:19) remains unfulfilled.
If the reason for the Arabic medium was to ensure understanding ("so that you may understand"), but the result is a text with verses that even the Author admits are unclear, then the medium has failed the objective. If the "Clear Arabic" results in "Ambiguous Verses," then either the Arabic is not clear, or the Author is incapable of utilizing the language to achieve His stated purpose.
This dilemma exposes a "linguistic bait-and-switch." The Quran invites the reader with the promise of easy, clear Arabic, but retreats into "mystery" and "ambiguity" the moment its verses are scrutinized for consistency.
Unlike the Biblical "Mystery" (mysterion) which refers to a truth once hidden but now fully revealed in Christ, the Quranic Mutashabihat remains an unresolved darkness in a book that calls itself "Light."