"I struggled hard but did not reap the fruits of my labors. Then I gazed into myself and found that my ego and my heart were unified. When the ego and the heart are united, a portion of all that shines upon the heart is seized by the self. Thus I came to know the cause of my dilemma; that the light illuminating my heart was being seized by my ego."

~Al-Nuri, in "Islamic Sufism"