If God renders one’s heart content with Submission, he will be following a light from his Lord. Therefore, woe to those whose hearts are hardened against God’s message; they have gone far astray.
أَفَمَن شَرَحَ اللَّهُ صَدرَهُ لِلإِسلٰمِ فَهُوَ عَلىٰ نورٍ مِن رَبِّهِ فَوَيلٌ لِلقٰسِيَةِ قُلوبُهُم مِن ذِكرِ اللَّهِ أُولٰئِكَ فى ضَلٰلٍ مُبينٍ
afaman sharahal laahu sadrahoo lil Islaami fahuwa ‘alaa noorim mir Rabbih; fa wailul lilqaasiyati quloobuhum min zikril laah; ulaaa’ika fee dalaalim mubeen