BG 17.4-6
Pure men worship the Gods; the passionate the gnomes and giants; the others, the dark folk, worship ghosts and troops of nature-spirits. The men who perform severe austerities, unenjoined by the Scriptures, wedded to vanity and egoism, impelled by the force of their desires and passions, Unintelligent, tormenting the aggregated elements forming the body, and Me also, seated in the inner body, know these demoniacal in their resolves.