Written in 437/1045, al-Qushayri's Epistle on Sufism. A Sufi textbook of the highest order where Sufi practices, states and stations, rules of travel, dreams and advice to the spiritual seeker, among other topics are related to Quranic verses, Traditions of the Prophet and sayings of early Sufis. Abd al-Qasim Abd al-Karim bin Hawazin al-Qushayri al-Naisaburi (b. 376/986 - 465/1072)