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

218 VEDĀNTA-PĀRIJĀTA-SAURABHA [SŪ. 1. 4. 3.
ADH. 1.]
We reply. The word "but" implies emphasis The body is the
gross effect, pradhāna is the subtle cause, and that alone is to be
understood; so the term "unmanifest" may very well refer to it. Why?
"Because of its fitness", i.e. because of the fitness of the subtle
pradhāna to assume the form of the effect, or because of the fitness of
the effect to assume the form of the cause. Just as in the text: 'All
this verily, is Brahman, emanating from Him, disappearing into Him
and breathing in Him' (Chānd. 3.14.1), the universe, though different
from Brahman as His effect, having been emanated from Him, is yet
declared to be non-different from Him, so is this body, which is non-
different from pradhāna.
Or else, (an alternative explanation;) because of the fitness of that
word "unmanifest", denoting the cause, to denote the effect too ¹,
as in the example: 'Mix the soma with cows' (Ṛg. V. 9.46.4 ²).
COMPARISON
Rāmānuja
Interpretation of 'tad arhatvāt' different, viz. because the
unmanifest matter alone, when it has assumed the form of the effect
(viz. body), is fit to undertake activities, promoting the end of men,
like a chariot ³
SŪTRA 3
"(PRADHĀNA) HAS A MEANING ON ACCOUNT OF (ITS) DEPENDENCE
ON HIM."
Vedānta-pārijāta-saurabha
Pradhāna, taught in the Upaniṣads, "has a meaning on account
of its dependence" on the Supreme Cause; while that admitted by
others is meaningless, such is the distinction (between our pradhāna
and that of others, viz. of the Sāṁkhyas).
¹ The argument is that the cause and the effect being non-different, a term
denoting the one, can very well denote the other. Hence the term 'unmanifest',
denoting pradhāna, the cause, can denote the body, its effect as well.
² P. 203, line 16. That is, the Soma is to be mixed, not with the cow, the
cause, but with the milk, its effect Here a word, denoting the cause, really
stands for the effect.
³ Śrī. B 1.4.2, p. 357, Chap. 1.