वेदान्त पारिजात सौरभ (भगवद् निम्बार्काचार्य - द्वैताद्वैत वेदान्त ब्रह्मसूत्र भाष्य सटीक)

[SŪ. 4. 1. 8-9.
ADH. 5.] VEDĀNTA-KAUSTUBHA 791
SŪTRA 8
“AND ON ACCOUNT OF CONTEMPLATION.”
Vedānta-pārijāta-saurabha
Meditation being of the form of contemplation, it is to be carried
on in a sitting posture alone.
Vedānta-kaustubha
“And” meditation being of the form of contemplation, as evident
from the text: “Should be meditated on” (Bṛh. 2.4.5, 4.5.6); and
contemplation, consisting of a continuous stream of ideas having the
form of the object contemplated, being possible only on the part of a
contemplating devotee who is sitting, there can be no question as to
the propriety of the above restrictive rule,—this is the sense.
SŪTRA 9
“AND WITH REFERENCE TO IMMOBILITY.”
Vedānta-pārijāta-saurabha
In the text: “The earth contemplates, as it were” (Chānd.
7.6.1 ¹), the word ‘contemplates’ has been used “with reference to
(its) immobility”. Hence one should practise meditation in a sitting
posture only.
Vedānta-kaustubha
In the scriptural text: “The earth contemplates, as it were. The
heaven contemplates, as it were. Water contemplates, as it were.
The mountains contemplate, as it were” (Chānd. 7.6.1), the term
‘contemplates’ has been used “with reference to the immobility”
of the earth and the rest. On account of this indicatory mark too,
meditation, having the form of contemplation, knowing and so on,
is to be practised in a sitting posture alone.
1 Ś. R. Bh. ŚK. B.