"Pṛṭhivī is the heart (or centre) of all odours; āpas is the heart of all tastes; ṭejas is the heart of all forms; vāyu is the heart of all touch; ākāś is the heart of all sounds; avyakṭa is the heart of gīṭās (or sounds); mṛṭyu is the heart of all Saṭṭvas; and mṛṭyu becomes one with the Supreme. And beyond Him, there is neither Saṭ nor asaṭ, nor Saṭ-asaṭ. Thus is the exposition of Nirvāṇa; thus is the exposition of the Veḍas; yea, thus is the exposition of the Veḍas."

Khaṇda XIV 1

"Pṛṭhivī is the food, and āpas is the eater; āpas is the food, and jyoṭis (or fire) is the eater; jyoṭis is the food, and vāyu is the eater; vāyu is the food, and ākāś is the eater; and akāś is the food and the inḍriyas (organs) are the eaters; inḍriyas are the food and manas is the eater; manas is the food, and buḍḍhi is the eater; buḍḍhi is the food, and avyakṭa is the eater; avyakṭa is the food, and akshara is the eater; akshara is the food, and

mṛṭyu is the eater; and mṛṭyu becomes one with the Supreme. Beyond Him, there is neither Saṭ nor asaṭ, nor Saṭ-asaṭ. Thus is the exposition of Nirvāṇa, and thus is the exposition of the Veḍas; yea, thus is the exposition of the Veḍas."

Khaṇda XV

Again Raikva asked: "O Lord, when this Vijñāna-ghana goes out (of the body or the universe), what does it burn and how?" To which He replied: "When it goes away, it burns prāṇa, apāna, vyāna, uḍāna, samāna, vairambha, mukhya, anṭaryāma, prabhañjana, kumāra, śyena, kṛshṇa, śveṭa, and nāga. Then it burns pṛṭhivī, āpas, ṭejas, vāyu, and ākāś; then it burns the waking, the dreaming, the dreamless sleeping and the fourth states as well as the maharlokas and worlds higher; then it burns the lokāloka (the highest world forming a limit to the other worlds). Then it burns ḍharma and aḍharma. Then it burns that which is beyond, is sunless, limitless, and worldless. Then it burns mahaṭ; it burns avyakṭa; it burns akshara; it burns mṛṭyu; and mṛṭyu becomes one with the great Lord. Beyond Him, there is neither Saṭ nor asaṭ, nor Saṭ-asaṭ. Thus is the exposition of Nirvāṇa, and thus is the exposition of the Veḍas; yea, thus is the exposition of the Veḍas."

Khaṇda XVI

"This Subāla-Bīja-Brahma-Upanishaḍ should neither be given out nor taught to one who has not controlled his passions, who has no sons, who has not gone to a Guru, and having become his disciple has not resided with him for a year, and whose family and conduct are not known. These doctrines should be taught to him who has supreme devotion to the Lord and as much to his Guru. Then these truths shine in his great soul. Thus is the exposition of Nirvāṇa; thus is the exposition of the Veḍas; yea, thus is the exposition of the Veḍas."

Footnotes

61:1 In the Chhānḍogya Upanishaḍ, Raikva is said to be the imparter of Samvargaviḍyā.