Lecture XX
Thus we avoided the pitfall of seeking the spiritual element solely in abstract concepts which are unable to deal with something that has been created by it, namely, the material world. What is spiritual must not live only in a Cloud-cuckoo-land floating above the material world. It must be so strong and intense that it can permeate the material element and show how spiritual it is and how it has been created by the spirit. Thus true spiritual knowledge must come to the possibility of understanding the material world and existence on the physical plane. It is important now, of all times, to pay attention to the interaction of spiritual and material elements in the human being, because now it is necessary properly to understand the intervention of something not material, namely, the folk soul, in the human being.
Cite:
GA 173c/1917-01-15/p004 · edition English