One of Rudolf Steiner's most important contributions to the understanding of the world was in the field of angelology - in the description and understanding of the work of spiritual beings, nature spirits, and the universe.

In this classic, unparalleled work of angelology, Steiner guides the reader from the experiences of sensing to the experience of the spiritual beings that operate in nature, in the elements and forces of the earth, and in the dynamic, cosmic work of the angelic hierarchies.

He unfolds in an inspired and magnificent vision the cosmic collaboration of hierarchical beings in cosmic and human evolution and shows how human beings, as angelic beings, participate in this process as the Tenth Hierarchy.