Imam al-Sadiq (AS) said, ‘When any of you feels softness and compassion, then he should supplicate, for no sooner does the heart soften than it becomes pure and sincere.
عنه (عَلَيهِ الّسَلامُ)
إذا رَقَّ أحدُكُم فَليَدعُ ، فإنَّ القلبَ لا يَرِقُّ حَتّى يَخلُصَ .
Similar narrations
Al-Kāfi #1660"When one of you feels tenderness in your heart, let him supplicate, for the heart does not become tender until it is sincere."