This section is from the book "Mahanirvana Tantra (Tantra of the Great Liberation)", by Translated by Arthur Avalon (Sir John Woodroffe). Also available from Amazon: Mahanirvana Tantra: Tantra of the Great Liberation.
The universe consists of a Mahabrahmanda, or grand Kosmos, and of numerous Brihatbrahmanda, or macrocosms evolved from it. As is said by the Nirvana Tantra, all which is in the first is in the second. In the latter are heavenly bodies and beings, which are microcosms reflecting on a minor scale the greater worlds which evolve them. "As above, so below." This mystical maxim of the West is stated in the Vishvasara Tantra as follows: "What is here is elsewhere; what is not here is nowhere" (yadihasti tadanyatra yannehasti natatkvachit). The macrocosm has its meru, or vertebral column, extending from top to bottom. There are fourteen regions descending from Satyaloka, the highest. These are the seven upper and the seven nether worlds (vide ante). The meru of the human body is the spinal column, and within it are the chakra, in which the worlds are said to dwell. In the words of the Shaktananda-Tarangini, they are pindamadhyesthita. Satya has been said to be in the sahasrara, and Tapah, Janah, Mahah, Svah, Bhuvah,
Bhuh in the ajna, vishuddha, anahata, manipura, svadishthana, and muladhara lotuses respectively. Below muladhara and in the joints, sides, anus, and organs of generation are the nether worlds. The bones near the spinal column are the kula-parvata. Such are the correspondences as to earth. Then as to water. The nadi are the rivers. The seven substances of the body (dhatu) are the seven islands. Sweat, tears, and the like are the oceans. Fire exists in the muladhara, sushumna, navel, and elsewhere. As the worlds are supported by the pravahana and other vayu ("airs"), so is the body supported by the ten vayu prana, etc. There is the same akasha (ether) in both. The witness within is the purusha without, for the personal soul of the microcosm corresponds to the cosmic soul (hiranyagarbha) in the macrocosm.
 
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