The Mysteries of Light, of Space, and of the Earth
GA 194
Four lectures given at Dornach in December, 1919, they are part of Steiner's Lectures on Spiritual Essence and its Working. They are the 9th through 12th of 12 lectures from the volume: The Mission of Michael. The Revelation of the Intrinsic Secret of the Human Being. They were published in German as: Die Sendung Michaels. Die Offenbarung der eigentlichen Geheimnisse des Menschenwesens.Translated by Frances E. Dawson
| I. | The Dualism in the Life of the Present Time | December 12, 1919 |
| II. | The Development of Architecture | December 13, 1919 |
| III. | Historical Occurrences of the Last Century | December 14, 1919 |
| IV. | The Old Mysteries of Light, Space, and Earth | December 15, 1919 |