For surely hardness of the heart has a cure ....

For surely hardness of the heart has a cure and its cure is by abundantly reciting the Qur’aan. The evidence for this is the statement of Allaah,

لَو أَنزَلنَا هَـٰذَا ٱلقُرءَانَ عَلَىٰ جَبَلٍ لَّرَأَيتَهُ ۥ خَـٰشِعًا مُّتَصَدِّعًا مِّن خَشيَةِ ٱللَّهِ‌
“Had We sent down this Qur’aan on a mountain, you would surely have seen it humbling itself and rend asunder by the fear of Allaah…”

[al-Hashr: 21]

A mountain is a firm rock that if the Qur’aan were to descend upon then it would become humble and break. The same goes for the heart, when the Qur’aan is recited while pondering over its meanings with deep contemplation then there is no doubt that it will affect the heart. Listen to the statement of Allaah,

إِنَّ فِي ذَلِكَ لَذِكْرَى لِمَنْ كَانَ لَهُ قَلْبٌ أَوْ أَلْقَى السَّمْعَ وَهُوَ شَهِيدٌ
“Verily, therein (the Qur’aan) is indeed a reminder for him who has a heart or gives ear while he is heedful.”

[Qaaf: 37]
Therefore, recite the Book of Allaah سبحانه و تعالى with contemplation and humility. As a result, Allaah سبحانه و تعالى will replace hardness of the heart with softness and He will cause you to return back to Him.