SB 10.4.30
akarnya bhartur gaditam
tam ucur deva-satravah
devan prati krtamarsa
daiteya nati-kovidah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
After hearing their master’s statement, the envious asuras, who were enemies of the demigods and were not very expert in their dealings, advised Kamsa as follows.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
There are two different types of men — the asuras and the suras.
dvau bhuta-sargau loke ’smin
daiva asura eva ca
visnu-bhaktah smrto daiva
asuras tad-viparyayah
(Padma Purana)
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 akiñcana 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.