As He says in (17...
As He says in (17:105): “With the truth did We send it down, and with the truth did it descend” meaning that the revelations and their ongoing validity are inseparable from the Truth. Thus in (10:32): “So what is there after the truth except for error?”. and in (41:41-42): ” Those who reject the Reminder when it comes to them… Indeed, it is an august Book– falsehood cannot approach it, at present or in future, a [revelation gradually] sent down from One all-wise, all-laudable”.
In other words, the Qur’an repulses, by its own perfection and completeness, any attempt to neither alter it; and neither now nor later can it be annulled or superseded. Many studies have been made on the permanence of the validity of the laws given in the Qur’an.
The reader is advised to consult them if he requires additional knowledge of the subject; to pursue the matter here, (namely, the position of the Qur’an in the lives of Muslims and the manner in which it demonstrates this), would be outside the scope of this book. The Qur’an as a Self-Contained Proof The Qur’an, being composed of words and meanings like any other book, explains itself. It does not remain silent when the situation of the text demands proof.
Moreover, there is no reason to believe that Qur’anic terms mean anything other than the actual words being used. This means that every man, possessing certain knowledge of the Arabic language, may dearly understand the meaning of the Qur’an just as he understands any other words written in Arabic.
There are many verses which are directed towards a specific group, such as the Tribe of Israel, or the Believers, or the non-believers and, sometimes, man in general; (they are addressed in phrases such as “O you who disbelieve” or “O people of the Book” or “O tribe of Israel” or “O Mankind’). The Qur’an discourses with them, offering them proof of its validity or challenging them to produce a book similar to it if they doubt it to be the Word of Allah.
Obviously, it makes no sense to address people in terms that they do not understand or to demand that they produce something similar to that which has no meaning for them. In chapter (47:24) we read: ” Do they not contemplate the Quran, or are there locks on the hearts?”. Implying that if it was from other than Allah, people would have found in it many inconsistencies.