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

explained the way to make that transcendental knowledge very steady and secure.
At the end of the Chāndogya Upaniṣad (8.15.1) it is said:
ācārya-kulād vedam adhītya yathā-vidhānaṁ guroḥ karmātiśeṣeṇābhisamāvṛtya
kuṭumbe śucau deśe svādhyāyam adhīyāno dharmikān vidadhātmani sarvendriyāṇi
sampratiṣṭhāpyāhiṁsān sarva-bhūtāny anyatra tīrthebhyaḥ sa khalv evaṁ vartayan
yāvad āyuṣaṁ brahmalokam abhisampadyate na ca punar āvartate.
"From the ācāryas one should learn the Vedas. One should perform his duties
and also offer dakṣiṇā to his spiritual master. Then one should accept household
life, live in a pure way, study the Vedas, perform his religious duties, engage all his
senses in the Supreme Lord's service, not harm any living being, and go on
pilgrimage to holy places. A person who passes his life in this way goes to the
spiritual world. He does not return to this world of repeated birth and death."
Saṁśaya (doubt): Are they who are not in the gṛhastha-āśrama able attain
transcendental knowledge, or are they not able to attain it?
Pūrvapakṣa (the opponent speaks): Here and there the scriptures may say that
the sannyāsīs are able to attain transcendental knowledge, but this is only flattery,
only empty words of praise. These passages merely mean that one should renounce
everything for the sake of the Supreme Personality of Godhead. The conclusion is
that in order to attain the Supreme Personality of Godhead one must accept the
gṛhastha-āśrama. That is the teaching of the scriptures.
Siddhānta (conclusion): In the following words the author of the sūtras gives
His conclusion.
Sūtra 48
kṛtsna-bhāvāt tu gṛhiṇopasaṁhāraḥ
kṛtsna—of all; bhāvāt—because of the existence; tu—but; gṛhiṇā—by the
gṛhastha; upasaṁhāraḥ—the goal.
But because of all the goal is by a gṛhastha.
Purport by Śrīla Baladeva Vidyābhūṣaṇa
The word "tu" (but) is used here to dispel doubt. This passage from the