spiritual disease of the heart

لِّيَجْعَلَ مَا يُلْقِى ٱلشَّيْطَـٰنُ فِتْنَةً لِّلَّذِينَ فِى قُلُوبِهِم مَّرَضٌ وَٱلْقَاسِيَةِ قُلُوبُهُمْ ۗ وَإِنَّ ٱلظَّـٰلِمِينَ لَفِى شِقَاقٍۭ بَعِيدٍ

[That is] so He may make what Satan throws in [i.e., asserts] a trial for those within whose hearts is disease and those hard of heart. And indeed, the wrongdoers are in extreme dissension.

أَمْ حَسِبَ ٱلَّذِينَ فِى قُلُوبِهِم مَّرَضٌ أَن لَّن يُخْرِجَ ٱللَّهُ أَضْغَـٰنَهُمْ

Or do those in whose hearts is disease think that Allāh would never expose their [feelings of] hatred?