Bhagavad Gita : अध्याय 14 का श्लोक 5
सत्त्वं रजस्तम इति गुणाः प्रकृतिसम्भवाः ।
निबध्नन्ति महाबाहो देहे देहिनमव्ययम् ॥
भावार्थ : हे अर्जुन! सत्त्वगुण, रजोगुण और तमोगुण -ये प्रकृति से उत्पन्न तीनों गुण अविनाशी जीवात्मा को शरीर में बाँधते हैं॥5॥
Material nature consists of the three modes-goodness, passion and ignorance. When the living entity comes in contact with nature, he becomes conditioned by these modes.
The living entity, because he is transcendental, has nothing to do with this material nature. Still, because he has become conditioned by the material world, he is acting under the spell of the three modes of material nature. Because living entities have different kinds of bodies, in terms of the different aspects of nature, they are induced to act according to that nature. This is the cause of the varieties of happiness and distress.