1. Negligence in acts of worship!

One of the symptoms of hard-heartedness is that a person does not like to perform good deeds. If he ever goes to the Masjid, he hastily offers Salah without extreme humility like a bird that is confined in a cage and trying to get free as soon as possible. Similarly, he begins to feel other obligatory acts and Wajibat as a burden. This symptom of hard-heartedness is very evil because the same symptom has been mentioned for hypocrites in the Holy Quran. Allah عَزَّوَجَلَّ has stated:

وَ   اِذَا   قَامُوۡۤ ا   اِلَی   الصَّلٰو ۃِ   قَامُوۡ ا کُسَالٰی  ۙ

Translation from Kanz-ul-Iman: And when they stand up for prayer, they do it unwillingly. (Part. 5, Surah An-Nisa, verse 142)

عِبادت میں لگتا نہیں دل ہمارا

ہیں عِصیاں میں بدمست ہم یا اِلٰہی

بڑی کوششیں کی گناہ چھوڑنے کی

رہے آہ! ناکام ہم یا اِلٰہی

May Allah عَزَّوَجَلَّ save us from this disaster (i.e. hardness of the heart) and grant us extreme humility in worship and recitation of the Holy Quran, as well as sincerity and steadfastness!

اٰمِيۡن بِجَاهِ النَّبِيِّ الۡاَمِيۡن صَلَّى اللّٰهُ تَعَالٰى عَلَيۡهِ وَاٰلِه وَسَلَّم

صَلُّوۡا عَلَى الۡحَبِيۡب           صَلَّى اللّٰهُ تَعَالٰى عَلٰى مُحَمَّد

2. Advice has no effect!

In the same way, one of the symptoms of hard-heartedness is that when a person is not inclined to pondering over the Hereafter or not doing good