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

scriptures declares that the goal is attained by a gṛhastha not because only they can
attain liberation but because everything else (kṛtsna-bhāvāt) is contained in
gṛhastha life. This means that all the duties of all the āśramas are in some way
included in the duties of gṛhastha life. Therefore the duties of other āśramas, such
as non-violence and sense-control, are duties for the gṛhasthas also. In fact no duty
in any other āśrama is incompatible with gṛhastha life. In the Viṣṇu Purāṇa it is
said:
bhikṣā-bhujaś ca ye kecit
pārivraḍ brahmacāriṇaḥ
te 'py atraiva pratiṣṭhante
gārhasthyaṁ tena vai param
"Sannyāsīs, brahmacārīs, and all others who eat the food of begging depend on
the gṛhasthas. Therefore the gṛhastha-āśrama is the best of āśramas."
Because the Śruti-śāstras declare that the followers of the other āśramas may
also attain liberation, if it is said that the followers of the gṛhastha-āśrama attain
the goal of life it is because that āśrama contains the duties of all the other
āśramas. This is explained in the following sūtra.
Sūtra 49
mauna-vad itareṣām apy upadeśāt
mauna—silence; vat—like; itareṣām—of others; api—also; upadeśāt—from the
teaching.
Because there is teaching of others like a silent sage.
Purport by Śrīla Baladeva Vidyābhūṣaṇa
The words "mauna-vat" here refer to the spiritual perfection already described.
In the Chāndogya Upaniṣad (2.23.1) it is said:
trayo dharma-skandhā yajño 'dhyayanaṁ dānam iti prathamas tapa eva dvitīyo
brahmacaryācārya-kula-vāsī tṛtīyo 'tyantam ātmānam ācārya-kule 'vasādayan sarva
ete puṇya-lokā bhavanti brahma-saṁstho 'mṛtatvam eti