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

Sūtra 4
tac chruteḥ
tat—that; chruteḥ—because of the Śruti-śāstra.
It is so because of the Śruti-śāstra.
Purport by Śrīla Baladeva Vidyābhūṣaṇa
In the Chāndogya Upaniṣad (1.1.8) it is said:
yad eva vidyayā karoti śraddhayopaniṣadā tad eva vīryavattaraṁ bhavati
"When one worships the Lord with transcendental knowledge, with faith, and
with the teachings of the Upaniṣads, his worship becomes very powerful and
effective."
Because it is here said "with transcendental knowledge", the subordinate nature
of that knowledge is clearly seen.
Sūtra 5
samanvārambhaṇāt
samanvārambhaṇāt—because of being together.
Because of being together.
Purport by Śrīla Baladeva Vidyābhūṣaṇa
In the Bṛhad-āraṇyaka Upaniṣad (4.4.2) it is said:
taṁ vidyā-karmaṇī samanvārabhete pūrva-prajñā ca