To remedy this, during the early twentieth century, Rudolf Steiner researched the psychic, spiritual, and cosmic nature of the Earth's interior. He described how the different layers of the inner Earth affect and interact with human beings living on Earth. More theologically and cosmically, he spoke of the layers of "Hell," through which Jesus Christ traveled in the period between the Crucifixion and the Resurrection, uniting and integrating himself with the Earth and with human destiny.
The seven authors in this book approach this difficult and little-discussed topic from different directions. They discuss how the forces emanating from the interior of the Earth affect the weather, our atmosphere, human beings, and how human behavior in turn affects them, showing that earthly and human evolution are a unity and should never be thought of as occurring separately. They also discuss the deep significance of Christ's incarnation, by which he united with the Earth to become the Spirit of the Earth.