" Scholars have said that if you want to know whether or not your heart is hard, then look at your eye. If it is dry and unmoved to tears, this is an indication of a hard heart. This is called jumūd al-ʿayn or “an unmoved eye.” A person who has sympathy and softness in the heart is said to have a moistened eye. "

― Hamza Yusuf , Purification of the Heart: Signs, Symptoms and Cures of the Spiritual Diseases of the Heart