Quran the remedy for heart diseases

يَا أَيُّهَا النَّاسُ قَدْ جَاءَتْكُمْ مَوْعِظَةٌ مِنْ رَبِّكُمْ وَشِفَاءٌ لِمَا فِي الصُّدُورِ وَهُدًى وَرَحْمَةٌ لِلْمُؤْمِنِينَ 

قُلْ بِفَضْلِ اللَّهِ وَبِرَحْمَتِهِ فَبِذَٰلِكَ فَلْيَفْرَحُوا هُوَ خَيْرٌ مِمَّا يَجْمَعُونَ 

O mankind! There has come to you an instruction from your Rabb, a cure for whatever (disease) is in your hearts, a guidance and a blessing for the true believers.
Say: "It is the grace and mercy of Allah (that He has sent this Qur'an), so let the people rejoice over it, for it is better than (the worldly riches) they are collecting."

Al-Quran 

(Surah Yunus-10, Ayah 57, 58)