لِّيَجْعَلَ مَا يُلْقِى ٱلشَّيْطَـٰنُ فِتْنَةً لِّلَّذِينَ فِى قُلُوبِهِم مَّرَضٌ وَٱلْقَاسِيَةِ قُلُوبُهُمْ ۗ وَإِنَّ ٱلظَّـٰلِمِينَ لَفِى شِقَاقٍۭ بَعِيدٍ Qur’an Al-Hajj (22:53)LiyajAAala m a yulqee a l shshay ta nu fitnatan lilla th eena fee quloobihim mara d un wa a lq a siyati quloobuhum wainna a l thth a limeena lafee shiq a qin baAAeed in
See 2:10 and the corresponding note.
Lit., "all [such] evildoers".
If any suggestion comes to the human mind that is not in accordance with Allah's Will and Plan, it has two opposite effects: to evil minds it is a trial and temptation from the satan but to the mind well-instructed in Faith, it stands self-condemned at once, and becomes a means of strengthening the Faith and stimulating redoubled efforts to conform to the Will of Allah.
Cf. ii. 10. I understand the "disease in the heart" to be an earlier state of curse, which leads in an intensified form to a complete "hardening of the heart".