The last verse: وَلَقَدْ صَرَّفْنَا (And surely We have explained — Al-Isra 17:89 ⧉) tells us that the Holy Qur’ an stands out as a miracle so clear that it leaves no room for any question and doubt. Still, what is happening is that people do not thank Allah for His blessings, do not even recognize the real worth of the blessing of the Qur'an and keep wandering around in error.