فَمَن يُرِدِ ٱللَّهُ أَن يَهۡدِيَهُۥ يَشۡرَحۡ صَدۡرَهُۥ لِلۡإِسۡلَٰمِۖ وَمَن يُرِدۡ أَن يُضِلَّهُۥ يَجۡعَلۡ صَدۡرَهُۥ ضَيِّقًا حَرَجٗا كَأَنَّمَا يَصَّعَّدُ فِي ٱلسَّمَآءِۚ كَذَٰلِكَ يَجۡعَلُ ٱللَّهُ ٱلرِّجۡسَ عَلَى ٱلَّذِينَ لَا يُؤۡمِنُونَ

Famai yuridil laahu ai yahdiyahoo yashrah sadrahoo lil islaami wa mai yurid ai yudillahoo yaj'al sadrahoo daiyiqan harajan ka annamaa yassa' 'adu fis samaaa'; kazaalika yaj'alul laahur rijsa 'alal lazeena laa yu'minoon

Those whom Allah (in His plan) willeth to guide,- He openeth their breast to Islam; those whom He willeth to leave straying,- He maketh their breast close and constricted, as if they had to climb up to the skies: thus doth Allah (heap) the penalty on those who refuse to believe.

— Al-An'am (ٱلْأَنْعَام), 6:125