And verily, this (Qur'an) is a Reminder for those who have Taqwa.meaning, the Qur'an.This is just as Allah says,قُلْ هُوَ لِلَّذِينَ ءَامَنُواْ هُدًى وَشِفَأءٌ وَالَّذِينَ لَا يُوْمِنُونَ فِى ءَاذَانِهِمْ وَقْرٌ وَهُوَ عَلَيْهِمْ عَمًىSay:"It is for those who believe, a guide and a healing. And as for those who disbelieve, there is heaviness (deafness) in their ears, and it (the Qur'an) is blindness for them." Then Allah says,وَإِنَّا لَنَعْلَمُ أَنَّ مِنكُم مُّكَذِّبِينَ