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I felt that there was an ominous sign of some kind of mild mental unbalance when, in the middle of quite serious conversation, the so-called Maharishi suddenly broke out into foolish needless disconcerting laughter. This repeated itself after intervals at the most unexpected times, so it was obviously a tendency. There is, however, a practice used in some Tibetan Lamaist sects of breaking out into laughing fits, but this is of a different origin. It is philosophic, a vocal act of judgement in weighing the world's reality against appearances.
-- Notebooks Category 15: The Orient > Chapter 3 : India Part 2 > # 552