Sutra 1.1.16

16. And because that (Brahman) which is referred to in the mantra is declared (to be the ānandamaya).

That Brahman which is described in the mantra, 'True Being, knowledge, infinite is Biahman,' is proclaimed as the Self abounding in bliss. And that Brahman is the highest Brahman, other than the individual soul; for the passage 'He who knows Brahman attains the Highest' refers to Brahman as something to be obtained by the individual soul, and the words 'On this the following verse is recorded' show that the verse is related to that same Brahman. The mantra thus is meant to render clear the meaning of the Brāhmaṇa passage. Now the Brahman to be reached by the meditating Devotee must be something different from him. The same point is rendered clear by all the following Brāhmaṇa passages and mantras: 'from that same Self sprang ether,' and so on. The Self abounding in bliss therefore is other than the individual soul.

Here an opponent argues as follows:—We indeed must acknowledge that the object to be reached is something different from the meditating Devotee; but the fact is that the Brahman described in the mantra does not substantially differ from the individual soul; that Brahman is nothing but the soul of the Devotee in its pure state, consisting of mere non-differenced intelligence, free from all shade of Nescience. To this pure condition it is reduced in the mantra describing it as true Being, knowledge, infinite. A subsequent passage, 'that from which all speech, with the mind, turns away, unable to reach it' (II. 9), expresses this same state of non-differentiation, describing it as lying beyond mind and speech. It is this therefore to which the mantra refers, and the Self of bliss is identical with it.—To this view the next Sūtra replies.