What philosophical argument does Chapter 8 make about the purpose of human life compared to animals?

Chapter 8 of the Sai Satcharitra presents a strong philosophical argument about the unique purpose of human existence. The text questions if life is merely for survival, noting that if it is only about eating, sleeping, fear, and mating, then there is no difference between a human and a dog or a pig. As stated in this chapter, dogs also fill their bellies and reproduce, so the greatness of the human body must lie elsewhere. The true duty and success of human birth, according to this chapter, is the attainment of the Supreme Self (Paramatman) and the realization of the Eternal, which distinguishes us from other creatures.