This volume presents the first modern English translation of Iamblichus' "De mysteriis"alongside the standard critical edition of the text by Edouard Des Places (Les Belles Lettres, 1966). Iamblichus provides a unique insight into the mystical side of late Neoplatonism, arguing that the only good is union with the gods and that the only route to this divine union is theurgy-religious ritual demonstrating supernatural power. The process of sacrifice, the activities of angels and demons, the meaning of divine possession, and the functioning of oracles are all examined in this extraordinary defense of theurgic mysticism against contemporary critics such as Porphyry. Clarke, Dillon, and Hershbell bring this famous and fascinating text to light through their introduction and extensive notes. Paperback edition is available from the Society of Biblical Literature (www.sbl-site.org)