56:77) إِنَّهُ لَقُرْآنٌ كَرِيمٌ
Indeed, it is a noble Qur'an
56:78) فِي كِتَابٍ مَّكْنُونٍ
In Book well protected
The Qura'n is preserved in the heart / mind / psyche of those who are bestowed with knowledge.
56:78 - In script well-guarded
56:79 - Which none shall touch but those who are clean / pure
56:80 - A Revelation from the Rabb of the knowledgeable.
It’s a clear sentence which means, its instructions can only be understood by those who are pure in thoughts or whose learning cups are empty / clean and pure.
Critics or researchers keep on blaming the old language of the book Quran, its poor interpretation / translation or its logical or illogical message without letting the inherent Teacher Rehman speak to them in their own language.
The book Qur'an never said its readers to learn Arabic language. It just instructed that Rehman is the teacher of the Qur'an but the reader assumed it as 114 chapter book.
Quran is a settled expression in us which speaks to us through Rasul (inner voice) in our own language.
Even the Shaitan speaks to us in our own language. There are many good and bad thoughts / senses which speaks to us and the combination of those dialogues is termed as Quran in the context of the book Qur'an.
The Arabic language Qur'an is for those who understand its language. It is not even for today's Arabs. It is only for those who understands the exclusive nature of terminologies of the book Qur'an.
10:37 - وَمَا كَانَ هَـذَا الْقُرْآنُ أَن يُفْتَرَى مِن دُونِ اللّهِ وَلَـكِن تَصْدِيقَ الَّذِي بَيْنَ يَدَيْهِ وَتَفْصِيلَ الْكِتَابِ لاَ رَيْبَ فِيهِ مِن رَّبِّ الْعَالَمِينَ
And it can never be this Al-Quran [the expression] that it be remitted / flagged / abated from weaker [Duni] system of consciousness [Allah], and but confirmation (of) what (is) within his power / sources / hands / ability, and brief explanation of the script [Al-Kitab], no doubt / suspicion in it, (it is) from the Knowledgeable Consciousness.