Chapters 3, 7, 13, 14, 17 and 18 of Bhagavad Gita discuss Guna . Verse 17.2 refers to the three Guna – sattvic , rajasic and tamasic – as innate nature (psychology or personality of an individual). Sattvic guna is one driven by what is pure, truth, compassionate, without craving, doing the right because it is right, positive and good. Tamasic guna is one driven by what is impure, dark, destructive, aimed to hurt another, contemptuous, negative and vicious. Rajasic guna is one that is ego-driven, out of personal passion, active, ostentatious, seeking the approval of others.In Chapters 17 and 18, Bhagavad Gita illustrates various items and actions by their three Guna . For example, three types of charity are discussed, and what makes charity as Sattvic , Rajasic or Tamasic . Similarly, food, relationships, knowledge and actions are detailed in terms of the three Guna. In Chapter 18, for example: नियतं सङ्गरहितमरागद्वेषतः कृतम् । अफलप्रेप्सुना कर्म यत्तत्सात्त्विकमुच्यते ॥२३॥ यत्तु कामेप्सुना कर्म साहंकारेण वा पुनः । क्रियते बहुलायासं तद्राजसमुदाहृतम् ॥२४॥ अनुबन्धं क्षयं हिंसामनपेक्ष्य च पौरुषम् । मोहादारभ्यते कर्म यत्तत्तामसमुच्यते ॥२५॥ Action that is virtuous, thought through, free from attachment, and without craving for results is considered Sattvic ; Action that is driven purely by craving for pleasure, selfishness and much effort is Rajasic ; Action that is undertaken because of delusion, disregarding consequences, without considering loss or injury to others or self, is called Tamasic . Bhagwad Gita