What is the philosophical argument in Chapter 8 about the purpose of human life, and how does it distinguish humans from animals?

Chapter 8 of the Sai Satcharitra presents a profound philosophical argument about the true purpose of human existence. It posits that if life is spent solely on basic activities like eating, sleeping, fear, and mating, there is little difference between a human and an animal like a dog or a pig. The text questions if the purpose of life is merely to be born, grow strong, and live a long time. According to the philosophy outlined in Chapter 8, the true and unique duty of a human birth is the attainment of the Supreme Self (Paramatman) and the realization of the Eternal. Without this higher pursuit, the chapter suggests that a human life, despite its potential, is essentially wasted.