गोविन्द भाष्य (श्रील बलदेव विद्याभूषण - अचिन्त्यभेदाभेद वेदान्त ब्रह्मसूत्र भाष्य सटीक)

Sūtra 15
sukha-viśiṣṭābhidhānād eva
sukha—by happiness; viśiṣṭa—distinguished; abhidhānāt—because of the
description; eva—indeed.
Also because He is described as (full of) bliss.
Purport by Śrīla Baladeva Vidyābhūṣaṇa
This sūtra refers to Chāndogya Upaniṣad (4.10.5), which says: prāṇo brahma
kaṁ brahma khaṁ brahma (the Supreme Personality of Godhead is life. the
Supreme Personality of Godhead is bliss. the Supreme Personality of Godhead is
sky). The discussion of the Supreme Personality of Godhead that begins with these
words continues through some paragraphs up to the paragraph under discussion
(Chāndogya Upaniṣad 4.15.1), which describes the person in the eye. For this
reason the person in the eye must be the Supreme Personality of Godhead. The
interpolation of agni-vidyā between 4.10.5 and 4.15.1 does not break the context
because agni-vidyā is a part of the discussion of the Supreme Personality of
Godhead. The word viśiṣṭa (distinguished) in this sūtra means that the Supreme
Personality of Godhead has all-knowledge and all other transcendental qualities.
Sūtra 16
śrutopaniṣatka-gaty-abhidhānāc ca
śruta—heard; upaniṣatka—Upaniṣad; gati—destination; abhidhānāt—because of
the description; ca—also.
And because of the description of the destination of they who hear the
Upaniṣads.
Purport by Śrīla Baladeva Vidyābhūṣaṇa