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The Bhagavad Gita's references to the hidden teaching are as follows: XVIII, 75: it is called "the ultimate mystery"; IX, 2: "the royal secret"; IX, 1: "a profound secret"; XVIII, 63: "profounder than profundity itself"; IX, 1: "profound beyond measure"; XVIII, 64: "the profoundest secret of all."
-- Notebooks Category 15: The Orient > Chapter 2 : India Part 1 > # 393