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The reference of Babaji giving initiation to Adi Shankara is found in Autobiography of a Yogi. As per Paramahansa Yogananda, Mahavatar Babaji himself stated that he gave initiation to Adi Shankara. Autobiography of a Yogi / Chapter 33 - Babaji, the Yogi-Christ of Modern India: Babaji’s mission in India has been to assist prophets in carrying out their ...


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It seems you can order books by him and on him from this website: https://sanskritclassics.com/new_releases.html (Shipping to India though...)


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As explained by others as well, there are 6 visible holes in head(every head is image of Brahman/God/Sun) i.e. 2 eyes, 2 ears, 1 nose and 1mouth and the 7th invisible opening for Satyaloka at top of head also called Brahmarandhra/Sahasrara chakra, which only enlightened Yogis can access and rupture at will. 7 being number of God(7 days in a week, 7 chakras ...


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