What is the philosophical argument made in Chapter 8 about the purpose of human life, and how is it compared to animals?

Chapter 8 of the Sai Satcharitra presents a profound philosophical argument about the true purpose of human existence. It posits that the primary duty of human birth is the attainment of the Supreme Self, or Paramatman. The text questions if life is merely about being born, growing, and breathing, suggesting that if one's life is only consumed by the four activities of eating, sleeping, fear, and mating, there is little difference between a human and an animal like a dog or a pig. As Chapter 8 states, dogs also fill their bellies and reproduce, so the greatness of the human body lies in its capacity for spiritual realization, not just survival.