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

"I know that Supreme Personality of Godhead, whose form is transcendental to
all material conceptions of darkness."*
Sūtra 21
bheda-vyapadeśāc cānyaḥ
bheda—difference; vyapadeśāt—because of the statement; ca—also; anyaḥ—
another.
The Supreme Personality of Godhead is different from the individual spirit soul
because this doctrine is taught in all Vedic literatures.
Purport by Śrīla Baladeva Vidyābhūṣaṇa
The golden person within the sun is not the individual spirit soul who is the
solar diety and who thinks the sun-planet is his own body, but rather that golden
person is the Supreme Personality of Godhead, the Supersoul who is present in
every atom. This is confirmed by the following statement of the Bṛhad-āraṇyaka
Upaniṣad:
ya āditye tiṣṭhann ādityād antaro yam ādityo
na veda yasyādityaḥ śarīraṁ ya ādityam antaro
yamayaty eṣa ta ātmāntaryāmy amṛtaḥ
"That person situated within the sun, who is not the sun-god, whom the sun-
god does not know, who manifests the sun-planet as His own body, who controls
the sun-planet from within, that person is the immortal Supreme Personality of
Godhead, who is present within the heart of every living entity as the Supersoul."
From this description we may understand that the golden person within the
sun is not the individual spirit soul who is the sun-god, but the Supreme
Personality of Godhead. Both this passage and the previous quoted passage from
the Chāndogya Upaniṣad agree on this point.
Adhikarana 8
The Word "Ākāśa" Refers to Brahman