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What is the origin of the institution of caste, for instance? The system was unknown in India before the Aryans arrived. They were a light-coloured people, as you know, and the Dravidians are very dark. They wished to keep their stock pure, to remain apart racially, and therefore established this rigid system of caste.
-- Notebooks Category 15: The Orient > Chapter 2 : India Part 1 > # 246