﴿الَّذِينَ آمَنُوا وَتَطْمَئِنُّ قُلُوبُهُمْ بِذِكْرِ اللَّهِ ۗ أَلَا بِذِكْرِ اللَّهِ تَطْمَئِنُّ الْقُلُوبُ﴾
28. Those who believed (in the Oneness of Allâh - Islâmic Monotheism), and whose hearts find rest in the remembrance of Allâh: verily, in the remembrance of Allâh do hearts find rest[2].