Chapter 18 Verses 18.41–48 Purification through prescribed duties of Varṇāśrama 18.41–44 The four social orders (varṇas) and their qualities 18.41 18.42 18.43 18.44 18.45–48 Importance of sticking to one’s prescribed duty 18.45 18.46 18.47 18.48 18.18–40The modes control all activities and all beings 18.49–55Brahman platform (Confidential knowledge)