PURPORT

Those who are devotees of Lord Visnu, Krsna, are suras, or devas, whereas those who are opposed to the devotees are called asuras. Devotees are expert in all transactions (yasyasti bhaktir bhagavaty akincana sarvair gunais tatra samasate surah). Therefore they are called kovida, which means "expert." Asuras, however, although superficially showing expertise in passionate activities, are actually all fools. They are neither sober nor expert. Whatever they do is imperfect. Moghasa mogha-karmanah. According to this description of the asuras given in Bhagavad-gita (9.12), whatever they do will ultimately be baffled. It was such persons who advised Kamsa because they were his chief friends and ministers.