Madhvaon Brahma Sūtra 3.4.37

“ Asuras by tlieir A'sura (evil) nature, A'sura intelli- gence, A'sura act and perverse knowledge surely go to the hell of darkness; the gods by their godly nature, godly act and right knowledge certainly attain to the highest abode of Vishnu; at no time or place and on no account the essential nature of either becomes changed ; and men are of mixed understanding and of mixed course*” says the Skanda Purana.