If we do not get upset whenever we miss an act of virtue or prayer and if we do not feel shame after committing an act of disobedience to Allah then that is a sign of the death of our (spiritual) heart.

—Ibn Ata illah Iskandari

(Read on pg 52, Dr. Gohar Mushtaq, The Intelligent Heart, The Pure Heart. Ta-Ha Publishers. London: 2006.)