Madhvaon Brahma Sūtra 3.4.40
Dvaita Vedānta
Sūtra
तद्भूतस्य तु तद्भावो जैमिनेरपि नियमात् पाभावेभ्यः
tadbhūtasya tu tadbhāvo jaiminerapi niyamāt pābhāvebhyaḥ
Sūtra translation
It is the conclusion also of Gaimini that what each is is its own nature, as may he seen from Brutis declaring the invariable rule, the absence of (acquiring) the nature it has not, (and the permanency of its own nature).
The state of being Asura belongs to the Asura class alone; and the state of being god also belongs only to the class of the gods. This is actually admitted by Gaimini too. For the restrictive rule is contained in the following Sruti: “The Asuras do not attain to the nature of the gods, nor do the gods attain to the state of being Asuras essentially; nor do men attain to either state, that of the gods or that of the Asuras; but all attain to their own nature.” “ The Asuras do not obtain the godly form (qualities) nor do the gods attain to that of the Asuras; and to neither do men attain. So every one is of the same nature as he (essentially) is and this (per- petual possession of right knowledge and other qualities) really constitutes Nature.” Thus the Sruti shows that one does not lose one’s nature and acquire that of another. and this is seen from the text which describes the auspicious and the inauspicious results (respectively) in the case of the gods and Asuras thus: “ The gods contemplated Him as Bhuti (prosperity) and they prospered ; therefore Vayu who abides in them, while they are asleep breathes even now as Bhuti, Bhuh (the Lord is the giver of prosperity); and the Asuras contemplate Him as Abhuh (destroyer of prosperity). Hence they are destroyed (thrown into hell” “(A. II. 1.8). The following is said in the Adhyatma. “ The mind of the gods is by nature set upon Vishnu as Bhuti (prosperity) and that of the Asuras as Abhuti (destroyer of prosperity); and it is an invariable rule that this uature does not change. But the gods only when overpowered by curses, became Prahlada and others; hence they (afterwards) attained to right knowledge and its fruit; otherwise no change of nature takes place.”