The Interior of the Earth: An Esoteric Study of the Subterranean Spheres
Rudolf Steiner(1861-1925) became a respected and  well-published scientific, literary, and philosophical scholar. He  developed his earlier philosophical principles into an approach to  methodical research of psychological and spiritual phenomena that has led  to innovative and holistic approaches in medicine, philosophy, religion,  education, science, agriculture, and the arts. He founded the General  Anthroposophical Society, which has branches throughout the world.