Building Stones for an Understanding of the Mystery of Golgotha: Human Life in a Cosmic Context, a collection of 17 lectures by Rudolf Steiner, CW 175, translated by Simon Blaxland-De Lange. Brought to you with the permission of Rudolf Steiner Press of London. (the older translation/recording is below all of these which I have left for archival purposes. I don't necessarily recommend them as I have gotten a bit better about recording!)
1. Lecture 1: (Berlin, 6 February 1917)
2. Lecture 2: (Berlin, 13 February 1917)
3. Lecture 3: (Berlin, 20 February 1917)
4. Lecture 4: (Berlin, 27 February 1917)
5. Lecture 5: (Berlin, 6 March 1917)
6. Lecture 6: (Berlin, 13 March 1917)
7. Lecture 7: (Berlin, 20 March 1917)
8. Lecture 8: (Berlin, 27 March 1917)
9. Lecture 9: (Berlin, 3 April 1917)
10. Lecture 10: (Berlin, 10 April 1917)
11. Lecture 11: (Berlin, 12 April 1917)
12. Lecture 12: (Berlin, 14 April 1917)
13. Lecture 13: (Berlin, 17 April 1917)
14. Lecture 14: (Berlin, 19 April 1917)
15. Lecture 15: (Berlin, 24 April 1917)
16. Lecture 16: (Berlin, 1 May 1917)
17. Lecture 17: (Berlin, 8 May 1917)
Building Stones for an Understanding of the Mystery of Golgotha, a collection of 8 lectures by Rudolf Steiner. This is a very old translation copublished by the Anthroposophic press, 1947. [More recent versions have 10 lectures] CW 175.
The entire book as a zip file.
1. A Key to the Understanding of the Mystery of Golgotha (March 27, 1917)
2. The Trichotomy of Man (April 3, 1917)
3. Irreligion, as illness, misfortune, and error (April 10, 1917)
4. Concerning the Physical and the Moral. (April, 12, 1917)
5. The Mysteries and Life. (April 14, 1917)
6. The Roman Emperors and Christianity (April 17, 1917)
7. The Roman Emperors, paganism, and Christianity (April 19, 1917)
8. The Crucifixion of Christ as an Historic Event. (April 24, 1917)