28الَّذينَ آمَنوا وَتَطمَئِنُّ قُلوبُهُم بِذِكرِ اللَّهِ ۗ أَلا بِذِكرِ اللَّهِ تَطمَئِنُّ القُلوبُShabbir AhmedThose who attain faith through reason, their hearts find rest in the practical remembrance of Allah, that is, in following His Commands. For, verily, remembering Allah by following His Commands ensures tranquility in the hearts.