The Deepening of Christianity, The Arthur Stream, The Grail Stream by Rudolf Steiner 

(August 21, 1924)
"Michael and the Cosmic Intelligence. The deepening of Christianity. The Arthur Stream. The Grail Stream. The School of Chartres. Aristotelianism and Christianity. On the karma of the Anthroposophical Movement"
From "Karmic Relationships Vol. 8"
(Titles of individual videos in general not titles given by Rudolf Steiner)
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