Gulen, M. Fethullah <br/><br/>
Emerald hills of the heart  : key concepts in the practice of Sufism  
M. Fethullah Gulen 
 - New jersey:  Tughra Books,  2011. 
 - 4 volume set. 
<br/><br/> This comprehensive study explores sufism as a form of self-purification, offering a deeper understanding of the sacred acts and a greater knowledge and love of the divine. The first volume of the series presents such sufi concepts as repentance, reflection, self-criticism, asceticism, piety, abstinence, self-supervision, and sincerity. 
<br/><br/><label>ISBN: </label>9781932099249 (hardcover) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sufism-Doctrines 
<br/><br/><label>Dewey Class. No.: </label>297.4  / GUE