The pearlers we meet in this book were early monks of Syria, Mesopotamia (Iraq), and Persia (Iran), They saw themselves as pearl-divers and pearl-merchants searching, through asceticism and prayer, for the precious pearls of mystical experience. Their quest led them into the wilderness, to a state of silent solitude in remote caves and hermitages. Working from Syriac manuscripts in the British Museum and the Vatican Library, and from the Greek...