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Mahendranath Gupta (Bengali: মহেন্দ্রনাথ গুপ্ত) (14 July 1854 – 4 June 1932), (also famously known as M and Master Mahashay), was a disciple of Ramakrishna—a 19th-century mystic and the author of Sri Sri Ramakrishna Kathamrita, a Bengali classic. He was also a teacher to Paramahansa Yogananda, a famous 20th century yogi, guru and philosopher.
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