According to Chapter 8, what is the true purpose of human life, and how does it differ from the existence of animals?

Chapter 8 presents a profound philosophical discourse on the purpose of human existence. It argues that the true duty of human birth is the attainment of the Supreme Self, or Paramatman. The chapter critiques a life spent merely on activities like eating, sleeping, fear, and mating, asking what difference there is between a human and a dog if life is reduced to these functions. As Chapter 8 points out, if nourishing the body and seeking sensual pleasure are the only goals, then this precious human birth is rendered useless. The text emphasizes that true success lies in realizing the Eternal, which makes a being truly fearless and independent.