What is the main philosophical argument presented at the beginning of Chapter 8 of the Sai Satcharitra regarding the purpose of human existence?

Chapter 8 of the Sai Satcharitra presents a profound philosophical argument about the purpose of human life. It posits that the true duty of being human is the attainment of the Supreme Self (Paramatman). The text critically questions a life spent merely on basic activities like eating, sleeping, procreation, and avoiding fear, suggesting that such an existence is no different from that of animals like dogs and pigs. As stated in Chapter 8, if nourishing the body and sensory pleasures are the only goals, then the human birth is considered useless. True success is defined as the realization of the Eternal, which makes a human being free, fearless, and independent.