heart becomes so hard due to not remembering death and the Hereafter, that advice does not affect the heart, a person gets inclined towards sins, he does not feel a sense of shame when committing sins and he does not consider repentance. (Siraat-ul-Jinaan, vol. 4, pp. 370)

Remember! The disease of hard-heartedness is not a minor disease, it is a destructive disease and hard-hearted people have also been condemned in the Holy Quran. In verse 74 of Surah Baqarah, part 1, Allah عَزَّوَجَلَّ has said:

ثُمَّ   قَسَتۡ   قُلُوۡ بُکُمۡ   مِّنۡۢ   بَعۡدِ   ذٰلِکَ   فَہِیَ   کَا لۡحِجَارَۃِ   اَوۡ   اَ شَدُّ   قَسۡوَۃً ؕ

Translation from Kanz-ul-Iman: Then after it, your hearts hardened - so they are like rocks, or even harder. (Part 1, Surah Al-Baqarah, verse 74)

Heart harder than stone!

Dear Islamic brothers! In the above-mentioned blessed verse, the hard-hearted people who have been mentioned, refers to those people of the Bani Israel who lived in the time of Sayyiduna Musa عَـلَيْـهِ الـسَّـلَام. It was stated about them that they did not learn any lesson after seeing great indications and miracles of Sayyiduna Musa عَـلَيْـهِ الـسَّـلَام. Their hearts became like stones, or rather harder than stones, because even stones get affected as from some of them streams flow out, some stones break and water flows out of them and some fall down due to the fear of Allah عَزَّوَجَلَّ, as Allah عَزَّوَجَلَّ Wills, but the human who has been given so much of common sense and understanding, whose senses are powerful, intellect is complete, (to him) evidences are clear, (and) opportunities of advice are present, even then he does not worship and obey Allah عَزَّوَجَلَّ. (Siraat-ul-Jinaan, part 1, vol. 1, pp. 146)

صَلُّوۡا عَلَى الۡحَبِيۡب           صَلَّى اللّٰهُ تَعَالٰى عَلٰى مُحَمَّد