Throughout the universe there are two classes of men. One is called devata and the other is called asura. Devata means visnu-bhakto bhaved daivah. Those who are devotees of the Supreme Personality of Godhead, who is known as Visnu... Sahasra visnu names there are. Original is Visnu. So those who are devotees of the Lord, they are called Vaisnava or devata, and those who are not devotees of Visnu may be devotees of other demigods, but they are called the demons or the asuras. There are many instances in the sastra. There were Hiranyakasipu, who was a devotee of Lord Brahma. Of course, the asuras are never devotees. Sometimes they worship the demigods for getting some material profit.
Lecture on Bhagavad-gita 13.1-2, Bombay, 25 September, 1973