A book on the religious, mystic origins and substance of philosophy. This is a critical survey of ancient and modern sources and of scholarly works dealing with Orpheus and everything related to this major figure of ancient Greek myth, religion and philosophy. Here poetic madness meets religious initiation and Platonic philosophy. This book contains fascinating insights into the usually downplaid relations between Egyptian initiation, Greek mysteries and Plato's philosophy and followers, right into Hellenistic Neoplatonic and Hermetic developments.