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قالَ رَسُولُ اللّهِ (صَلَّى اللّهُ عَلَيْهِ وَ آلِهِ وَسَلَّمَ): إِقْرَؤُوا الْقُرآنَ ما ائْتَلَفَتْ عَلَيْهِ قُلُوبُكُمْ وَ لانَتْ عَلَيْهِ جُلُودُكُمْ فَإِذا اخْتَلَفْـتُمْ فَلَسْـتُمْ تَقْرَؤُونَهُ.
The Messenger of Allah (blessings of Allah be upon him and his family) has said: “Recite the Qur’an in such a way that your hearts develop a love for it and your skin becomes softened by it. However as soon as your hearts become indifferent to it (meaning that the Qur’an has no effect on you), then stop reciting it.”
Mustadrakul Wasa’il, Volume 4, Page 239