What convergence is there between the spiritual path of the Theravada master Ajahn Mun and Madame Guyon, the still largely unknown great Christian mystic? Between Gerta Ital, who took the path of the Rinzai school of Zen Buddhism, and Swami Ramdas, who practiced bhakti yoga, the path of devotion? What are the denominators common to these out-of-the-ordinary beings who, in such apparently different ways, have climbed the ladder leading to the ultimate...