'Sirriyeh's book makes a fresh contribution to our understanding of Sufi life and thought in the pre-modern era of Islam. It provides new insights into Sufi manifestations of the seventeenth and eighteenth centuries, and adds to the ongoing debates around the concept of "Neo-Sufism".' - Itzchak Weismann, Middle East Studies Association Bulletin, Volume 40 Number 2, December 2006