Brahma Sūtra 3.3.45
Śaṅkara
Advaita Vedānta
Sūtra
पूर्वविकल्पः प्रकरणात्स्यात्क्रिया मानसवत्
pūrvavikalpaḥ prakaraṇātsyātkriyā mānasavat
Sūtra translation
(The agni built of mind, &c.) is a particular form of the preceding one (i.e. the agni built of bricks), on account of the leading subject-matter; it is (part of) the act; as in the case of the mdnasa cup.
. Your supposition, the purvapakshin objects, as to those fire-altars being not supplementary to the sacrificial act, but altogether independent of it, is untenable.
Rāmānuja
Viśiṣṭādvaita Vedānta
Numbered 3.3.44 in this text
Sūtra
पूर्वविकल्पः प्रकरणात्स्यात्क्रिया मानसवत्
pūrvavikalpaḥ prakaraṇātsyātkriyā mānasavat
Sūtra translation
There is option with regard to what precedes (i.e. the altar made of bricks) on account of subject-matter, and hence there is action; as in the case of the mânasa cup.
In the Vâjasaneyaka, in the Agnirahasya chapter, there are references to certain altars built of mind, 'built of mind, built of speech,' &c. The
Madhva
Dvaita Vedānta
Numbered 3.3.46 in this text
Sūtra
पूर्वविकल्पः प्रकरणात्स्यात् क्रियामानसवत्
pūrvavikalpaḥ prakaraṇātsyāt kriyāmānasavat
Sūtra translation
An option for the change of preceptor in the matter of grace (to he shown by the new master) obtained is admissible as in the case of mental acts.
It is not obligatory that he who is at first sought as preceptor is to be the only preceptor ; even another pre- ceptor