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

As for the various fruitive results, such as the attainment of rain, a son, or
residence in the celestial material planets, that are offered to the follwers of the
karma-kāṇḍa rituals in the Vedas, these beneifts are offered to attract the minds of
ordinary men. When ordinary men see that these material benefits are actually
attained by performing Vedic rituals, they become attracted to study the Vedas. By
studying the Vedas they become able to discriminate between what is temporary
and what is eternal. In this way they gradually become averse to the temporary
things of this world and they come to hanker after Brahman. In this way it may be
understood that all the parts of the Vedas describe the Supreme Personality of
Godhead.
Vedic rituals bring material benefits as a result only when the performer of the
ritual is filled with material desire. If the performer is materially desireless, then he
does not gain a material result, but rather the result he obtains is purification of
the heart and the manifestation of spiritual knowledge. Therefore, the meaning of
the previously quoted text from Bṛhad-āraṇyaka Upaniṣad (4.4.22) is that the
demigods are considered to be the various limbs of the Supreme Personality of
Godhead, and by worshiping them, one actually worships the Supreme Lord, and
the result of such worship is that one gradually become pure in heart and awake
with spiritual knowledge.
Adhikaraṇa 5
Brahman Is Knowable

1. Viṣaya (statement): Now, by the use of logic and scriptural quotation, we
   shall refute the misconception that Brahman cannot be described. One may argue,
   however, that many scriptural passages support the theory that Brahman cannot be
   described by words. For example:
   yato vāco nivartate
   aprāpya manasā saha
   "The mind cannot understand the Supreme Personality of Godhead and words
   cannot describe Him."
   —Taittrīya Upaniṣad 2.4.1
   yad vacanābhyuditaṁ yena vāg abhyudyate tad eva
   brahma tad viddhi nedaṁ yad idam upāsate
   "No one has the power to describe Brahman with words, even though
   everyone's speech occurs by the power granted by Brahman. Know that this
   Brahman is not material. Worship this Brahman."