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

ātmā prakaraṇāt
ātmā—the Supreme Personality of Godhead; prakaraṇāt—because of the
context.
It is the Supreme Personality of Godhead, because of the context.
Purport by Śrīla Baladeva Vidyābhūṣaṇa
The word "jyotiḥ" here refers to the Supreme Personality of Godhead. It does
not refer to the sun-globe. Why is that? The sūtra explains, "prakaraṇāt" (because
of the context). Although the word "jyotiḥ" can refer to either, because of the
context it refers to the Supreme Personality of Godhead. It is like the word
"devaḥ", which in the sentence "devo jānāti me manaḥ" (your lordship knows my
heart) means "your lordship".
The word ātmā" in this sūtra means "the Supreme Personality of Godhead, who
is all-powerful and full of knowledge and bliss". The word "ātmā" is derived from
the verbal root "at". In this way "ātmā" means, "He who is splendidly manifest",
"He who is attained by the liberated souls", and "He who is all-pervading". It also
means "Upaniṣad", and it has many other meanings also. Further, the word
"ātmā" also shows that the Supreme is a person. This is also seen by the use of the
phrase "uttamaḥ puruṣaḥ" in the Upaniṣads and Bhagavad-gītā. In this way it is
seen that the "paraṁ jyotiḥ" in Chāndogya Upaniṣad (8.12.3) refers to the
Supreme Personality of Godhead, Lord Hari.
Adhikaraṇa 2
The Individual Soul Meets the Supreme Personality of Godhead
Introduction by Śrīla Baladeva Vidyābhūṣaṇa
Now another topic will be considered.
Saṁśaya (doubt): When the liberated soul attains the effulgent Supreme in the
spiritual world, is the liberation sālokya (residing on the same planet) or sāyujya
(meeting with the Lord)?