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

The Supreme Personality of Godhead is the qualities of knowledge and bliss
themselves, and He is also a person who possesses the qualities of knowledge and
bliss. He is like a snake and its coils. As a snake both is and possesses its coils, so
the Supreme Personality of Godhead both is and possesses His qualities. How is
this known? The sūtra explains: “Because there is description of both.” The Śruti-
śāstra describes both. That is the meaning. The word "tu" (indeed) here hints that
the passages of the Śruti-śāstra have a single meaning. The meaning here is that the
Lord is inconceivable. The Lord is not divided. It is not that these two kinds of
explanations of the scriptures mean that one part of the Lord has one nature and
another part of Him has a different nature. He is not divided into parts in that way.
Sūtra 29
prakāśāśrayavad vā tejastvāt
prakāśa—of light; āśraya—the shelter; vat—like; vā—or; tejastvāt—because of
being splendid.
Or, because He is effulgent He is like an abode of light.
Purport by Śrīla Baladeva Vidyābhūṣaṇa
Because the Supreme Personality of Godhead is effulgent, that is to say because
He is full of consciousness, therefore He is the abode of light. That is the
conclusion. As the effulgent sun is the abode of light, so the all-knowing Supreme
Personality of Godhead is the abode of knowledge. That is the meaning. The word
"tejaḥ" is defined to mean either “the destroyer of ignorance” or “the destroyer of
darkness".
Sūtra 30
pūrvavad vā
pūrva—past; vat—as; vā—or.
Or, as the past.