The purport of BU (BV) 2.1 is: The Brahman alone is TRUTH and only appears as this world comprising five elements, names and forms and sense-organs (pranas) that are related as causes and their means. Consequently, BU (BV) 2.2 and 3 explain the (real) nature of the pranas and the gods superintending over them, thereby seeking to explain prana vai satyam Finally, it is shown how the Brahman obtains as the twofold world murta 'what has form' and amurta 'what has no form'. This determines the significance of the Upanisadic teaching neti neti.