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

"The earth is still, as if it were rapt in meditation."
This also hints that meditation should be performed when one is sitting in a
yoga āsana. Even in the mundane affairs of the world the word "dhyāna" is used in
this way, as in the sentence, "dhyāyati kāntaṁ proṣita-ramaṇī" (the girl is still, rapt
in meditation on her absent beloved).
Sūtra 10
smaranti ca
smaranti—the Smṛti-śāstra; ca—also.
The Smṛti-śāstra also.
Purport by Śrīla Baladeva Vidyābhūṣaṇa
In Bhagavad-gītā (7.11-13), the Supreme Personality of Godhead explains:
śucau deśe pratiṣṭhāpya
sthiram āsanam ātmanaḥ
nāty-ucchritaṁ nāti-nīcaṁ
cailājina-kuśottaram
tatraikāgraṁ manaḥ kṛtvā
yata-cittendriya-kriyaḥ
upaviśyāsane yuñjyāt
yogam ātma-viśuddhaye
samaṁ kāya-śiro-grīvaṁ
dhārayann acalaṁ sthiraḥ
samprekṣya nāsikāgraṁ svaṁ
diśaś cānavalokayan
"To practice yoga, one should go to a secluded place and should lay kuśa grass
on the ground and then cover it with a deerskin and a soft cloth. The seat should
be neither too high nor too low and should be situated in a sacred place. The yogī
should then sit on it very firmly and practice yoga to purify the heart by
controlling his mind, senses, and activities and fixing the mind on one point. One
should hold one's body, head, and neck erect in a straight line and stare steadily at