These profound studies of the cosmic forces behind the four great festivals of the year provide a wealth of material for fruitful meditation. Rudolf Steiner presents great imaginative pictures that unite the heavens and the earth through a portrayal of the activities of the archangels Michael, Gabriel, Raphael, and Uriel. In the course of the lectures, he offers spiritual wisdom on subjects that include the alchemical processes of sulphur, mercury, and salt in the cosmos, man and the plant, spiritual combustion processes, crystals, clouds, meteors, the movements of elemental beings in nature, and the conflicting efforts of the two great adversaries to divert the earth from its true goal.