What does Chapter 8 say about the purpose of human life and how it differs from the existence of animals?

Chapter 8 delves deeply into the philosophy of human existence, arguing that its true purpose is the attainment of the Supreme Self (Paramatman). The text poses a critical question: if life is merely spent on eating, sleeping, fear, and mating, what distinguishes a human from a dog or a pig? It asserts that if nourishing the body and seeking pleasure are the sole aims, then human birth is rendered useless. As explained in Chapter 8, the greatness of human life lies in our capacity for freedom and independence, which should be used to realize the Eternal. This spiritual pursuit is what elevates human existence beyond the mere survival instincts shared with animals.