The Sun Mystery and the Mystery of Death and Resurrection (Exoteric and Esoteric Christianity), a collection of 12 lectures by Rudolf Steiner (CW 211) in the new collected works by Steinerbooks.
For your convenience, below is a zip file of this entire set of lectures. It does require that you have an unzipping utility of some kind on your computer. For you mac people this is built in.
1. The Life of the Human Soul in Sleeping, Waking, and Dreaming (Berne, March 21, 1922)
2. The Three States of Night Consciousness (Dornach, March 24, 1922)
3. The Transformation of Worldviews (Dornach, March 25, 1922)
4. Historical Changes in the Experience of Breathing (Dornach, March 26, 1922)
5. The Human Being as Portrayed in Greek Art (Dornach, March 31, 1922)
7. Exoteric and Esoteric Christianity (Dornach, April 2, 1922)
8. The Teachings of the Risen Christ (The Hague, April 13, 1922)
9. Spiritual Insight and Initiation (London, April 14, 1922)
10. Perceiving the Christ through Anthroposophy (London, April 15, 1922)
11. The Threefold Sun and the Risen Christ (London, April 24, 1922)
12. Anthroposophy as an Attempt to Enchristen the World (Vienna, July 11, 1922)