inḍriyas into ṭanmāṭras (rudimentary properties), ṭanmāṭras into bhūṭāḍi, bhūṭāḍi into mahaṭ, mahaṭ into avyakṭa, avyakṭa into akshara (the indestructible), akshara into Lamas (darkness). And Lamas becomes one with the supreme Lord. And then there is neither Saṭ nor asaṭ, nor Saṭ-asaṭ. This is the teaching of Nirvāṇa and this is the teaching of the Veḍas. Yea, This is the teaching of the Veḍas."
Khaṇda III
"At first, there was Asaṭ, unborn, non-existent, unsupported, soundless, touchless, formless, tasteless, odourless, and decayless. The undaunted man never grieves, as he knows Āṭmā to be great, all-pervading and unborn. It (Āṭma) is prāṇaless, mouthless, earless, tongueless, manas-less, ṭejas-less, eyeless, nameless, goṭraless (or clanless), headless, handless, feetless, non-unctuous, bloodless, non-measurable, neither long nor short, neither gross nor atomic, neither great nor small, endless, indescribable, nonreturnable, non-luminous, not hidden, having neither inside nor outside, neither eating anything nor being eaten by others. Some one (out of many) attains to this (Āṭmā) by the six means of saṭya (truth), ḍāna (charity), ṭapas (religious austerities), non-injury to any creature, celibacy and complete indifference to worldy objects; 1 and there are no other means. Whoever feels happy with the thought 'I know That', that learned person's prāṇa will never get out of his body at the moment of death, but will become absorbed in Brahman; and being absorbed in Brahman, he attains the state of Brahman Itself as he who knows this."
Khaṇda IV
"In the middle of the heart is a red fleshy mass in which is the ḍahara-lotus. Like the lotus, it opens into many (petals). There are ten openings in the heart. The (different kinds of) prāṇas are located there. Whenever he (Āṭmā) is united with
prāṇa, he sees cities with rivers and other variegated things; when united with vyāna, he sees Ḍevas and Ṛshis; when united with apāna, he sees Yakshas, Rākshasas and Ganḍharvas; when united with udāna, he perceives the celestial world, Ḍevas, Skanḍa (Kārṭikeya or the six-faced Mars), and Jayanṭa (Inḍra's son); when united with samāna, he sees the celestial world and the treasures (of Kubera); when united with rambhā (a nādi hereafter given out), he sees whatever is seen or not seen, heard or not heard, eaten or not eaten, asaṭ or Saṭ and all else.