الَّذِينَ آمَنُوا وَتَطْمَئِنُّ قُلُوبُهُم بِذِكْرِ اللَّهِ ۗ أَلَا بِذِكْرِ اللَّهِ تَطْمَئِنُّ الْقُلُوبُ

This verse highlights the profound psychological and spiritual benefit of remembering Allah. It teaches that true peace of heart and mind comes through connecting with the Divine. The 'remembrance of Allah' includes prayer, recitation of the Quran, meditation on Allah's attributes, and maintaining awareness of Allah throughout daily activities. This verse offers a solution to anxiety, stress, and spiritual emptiness by directing believers to the ultimate source of tranquility.