Jean known to Christians as St. John of the Cross, was a master of mysticism. Msgr. Cristiani tells his life-story here for the edification of the average reader who will benefit personally from understanding more about this historic mystic who harmoniously combined word and deed as have few men. Though he died in the sixteenth century, his doctrinal significance has truly become recognized only recently. Throughout the book, the author quotes liberally from the writing of St. John of the Cross. In an afterward the author includes the Seventeen Counsels of this prince of mystical theology. To bring the message of John of the Cross to the contemporary soul which he sees as gravely ill- is the purpose of Msgr. Cristiani. This he has done well. According to St. John of the Cross the health of the soul is the love of God. May this introduction to St. John promote the health of the modern soul by enlisting new devotees to the great saint's way of life.