In these lectures, Steiner's main intention is to throw light on the hidden content of the picture-language of myths, sagas and legends. Pictures, he explains, are the real origin of all things - the primeval spiritual causes. In order to work in a healthy way with pictures or symbols it is necessary that one should first become acquainted with their esoteric content - to understand them. He discusses principally Freemasonry and its background, also Rosicrucians, Manichaeism, Druids, the Prometheus Saga, the Lost Temple, Cain and Abel and more.