We cannot say that other worlds than the sense world do not concern us; we are in their midst. We must realize that, while we are walking about here on this earth, we walk through the spiritual worlds exactly as we walk through the physical air.
Source: Rudolf Steiner – GA 194 – The Mysteries of Light, of Space, and of the Earth – Lecture III – Dornach, 14th December 1919
Translated by Frances E. Dawson
Previously posted on November 2, 2015