For spiritual seekers and practitioners of the occult, the "Big Three" of Indian esoteric sciences— (the technique), Mantra (the sound), and Yantra (the sacred geometry)—represent a profound path to self-realization and worldly mastery.
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Yantra, Mantra Tantra Vidhya : Dediyar, Vladimir : Free Download, Borrow, and Streaming : Internet Archive. Internet Archive