As Eliot comments in his note for line 401 this is an allusion to the Brihadaranyaka Upanishad. The Exploring The Waste Land site has a translation of The Voice of Thunder section of the Brihadaranyaka Upanishad.
Eliot has again referred us to Jesse L. Weston's book From Ritual to Romance, this time to have us read what she wrote on the Chapel Perilous. An HTML e-text of From Ritual to Romance is available at The Celtic Twilight web site where there is other material on the Grail legend.
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