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– Knowing how to pronounce bījas (e.g., “Raṃ” as “Rung” with nasal) is essential.
, detailing the subtle energy centers (chakras) and the "Serpent Power" that resides within the human body. Amazon.com Core Guide to the Shat Chakra Nirupana
– Since it’s originally part of Haṭha Yoga Pradīpikā , reading the preceding chapters (āsana, prāṇāyāma, mudrā) helps understand why chakra meditation is the final stage.