ذَلِكَ بِأَنَّ اللّهَ لَمْ يَكُ مُغَيِّرًا نِّعْمَةً أَنْعَمَهَا عَلَى قَوْمٍ حَتَّى يُغَيِّرُواْ مَا بِأَنفُسِهِمْ وَأَنَّ اللّهَ سَمِيعٌ عَلِيمٌ
[8:53]
This is because Allah has never changed a favor which He has conferred upon a people until they change their own condition; and because Allah is Hearing, Knowing;
"Because Allah will never change the grace which He hath bestowed on a people until they change what is in their (own) souls: and verily Allah is He Who heareth and knoweth (all things)."
That is because Allah never changeth the grace He hath bestowed on any people until they first change that which is in their hearts, and (that is) because Allah is Hearer, Knower.