According to Chapter 8, what is the true purpose of human life, and how is it distinguished from the lives of animals?

Chapter 8 explains that the purpose of human life is not merely to survive by engaging in activities like eating, sleeping, procreating, and fearing. The text poses a rhetorical question, asking what dogs and pigs lack in terms of mere survival, suggesting that if a human's life is only about these things, it is useless. As detailed in Chapter 8, the true and unique duty of a human birth is the attainment of the Supreme Self (Paramatman). A human being is described as free and independent, and the realization of the Eternal is presented as the genuine success of this precious birth, distinguishing it from all other forms of life.