The section distinguishes the indestructible being, which is the source of all, &c., from the Pradhâna as well as the individual soul, in so far, namely, as it undertakes to prove that by the cognition of one thing everything is known; and it moreover, in passages such as 'higher than the high Indestructible,' explicitly states the difference of the indestructible being from those other two.--The text first relates that Brahmâ told the knowledge of Brahman, which is the foundation of the knowledge of all, to his eldest son Atharvan: this introduces the knowledge of Brahman as the topic of the section. Then, the text proceeds, in order to obtain this knowledge of Brahman, which had been handed down through a succession of teachers to Angiras, Saunaka approached Angiras respectfully and asked him: 'What is that through which, if known, all this is known?' i.e. since all knowledge is founded on the knowledge of Brahman, he enquires after the nature of Brahman. Angiras replies that he who wishes to attain Brahman must acquire two kinds of knowledge, both of them having Brahman for their object: an indirect one which springs from the study of the sâstras, viz. the Veda, Sikshâ, Kalpa, and so on, and a direct one which springs from concentrated meditation (yoga). The latter kind of knowledge is the means of obtaining Brahman, and it is of the nature of devout meditation (bhakti), as characterised in the text 'He whom the Self chooses, by him the Self can be gained' (III, 2, 3). The means again towards this kind of knowledge is such knowledge as is gained from sacred tradition, assisted by abstention and the other six auxiliary means (sec above, p. 17); in agreement with the text, 'Him the Brahmattas seek to know by the study of the Veda, by sacrifice, by gifts, by penance, by fasting' (Bri. Up. IV, 4, 22).--Thus the Reverend Parâsara also says, 'The cause of attaining him is knowledge and work, and knowledge is twofold, according as it is based on sacred tradition or springs from discrimination.' The Mundaka-text refers to the inferior kind of knowledge in the passage 'the lower knowledge is the Rig-veda,' &c., up to 'and the dharma- sâstras'; this knowledge is the means towards the intuition of Brahman; while the higher kind of knowledge, which is called 'upâsanâ,' has the character of devout meditation (bhakti), and consists in direct intuition of Brahman, is referred to in the clause 'the higher knowledge is that by which the Indestructible is apprehended.' The text next following, 'That which is invisible, &c., then sets forth the nature of the highest Brahman, which is the object of the two kinds of knowledge previously described. After this the passage 'As the spider sends forth and draws in its thread' declares that from that indestructible highest Brahman, as characterised before, there originates the whole universe of things, sentient and non-sentient. The next soka (tapasâ kîyate, &c.)