Impact of the Qur'an in mending Hearts

A short piece of the back of the book:

Many people say, "We hear the Qur'ān but it does not cause us any reverence or remembrance." Many people recite the Qurān while they are absent minded; the tongue may utter the words of the Qur'ān but the heart is absent. So how is it possible for such heart to receive the effect of the Quran?! The Noble Qur'ān is a healing for every disease, a healing for the hearts, and a healing for every bad thing; it cleans and purifies the heart.