Al-Imām ibn al-Qayyim [may Allāh have mercy on him] said:
“There is nothing more beneficial to the heart than reciting the Qur’ān, with contemplation and reflection. The Qur’ān bequeathes love, aspiration, fear, hope, repentance, reliance, pleasure, contentment, authority, gratitude, patience, and the all other [necessary] conditions that are life [i.e.vital] to the heart and perfection of it. Likewise, it repels all reprehensible characteristics and actions which cause corruption and destroy the heart.”
Miftāh Dār is-Sa’ādah, 1/187 | Al-Imām ibn al-Qayyim [may Allāh have mercy on him]