It is also one of the 5 Bindu Upanishads (Tejo-Bindu, Amrita-Bindu, Dhyana-Bindu, Brahma-Bindu) attached to the Atharvaveda.
The manuscripts of Nadabindu discovered in different parts of India, partially vary in the Kala list. For example, the Calcutta version differs from Poona edition by replacing Dhriti with Dhruva, and Mauni for Nari.
== Content ==
The teaching goes beyond the Brahman : What is beyond that is the Para-Brahman, the pure all-penetrating, beyond the Kalas, the ever-shining and the source of all the Jyotis (light), should be known.
Dharma (ethics) is a requirement for a Yogi life. It it is notable for describing Om symbol with twelve moras instead of three and half moras commonly found in ancient Indian literature.
The yogin contemplates on Omkara as Hamsa, in twelve Kalas or variations of the four matras (intonations). The variation is produced by the three svara (note on the musical scale), namely Udatta, Anudatta and Svarita. Chapter 2 describes the sounds heared during contemplation.
The twelve Kalas, according to Nadabindu text, are Ghosini, Vidyunmali, Patangini, Vayuvegini, Namadheya, Aindri, Vaishnavi, Sankari, Mahati, Dhriti, Nari and Brahmi.
The text suggests that a yogin should contemplate and be absorbed in the Om with these Kalas, as it leads one to knowledge of Atman or Self, helps him overcome three types of Karma. The text also refers to the Vedanta theory of Ajnana (ignorance) as the cause of bondage. It suggests that a yogin should listen to his inner voice in Siddhasana.
== Weblinks ==
* Aiyar, K. Narayanasvami (trans.), NĀḌABINḌU-UPANISHAḌ OF ṚGVEḌA in Thirty Minor Upanishads, 1914 -online