यजन्ते सात्त्विका देवान्यक्षरक्षांसि राजसाः। प्रेतान्भूतगणांश्चान्ये यजन्ते तामसा जनाः ॥

yajante sāttvikā devān yakṣha-rakṣhānsi rājasāḥ pretān bhūta-gaṇānśh chānye yajante tāmasā janāḥ

Pure men worship the Gods; the passionate the gnomes and giants; the others, the dark folk, worship ghosts and troops of nature-spirits.

In plain words: Krishna says pure people worship the gods. Passionate people worship powerful spirits and giants. Dark people worship ghosts and spirits of nature.