What is the 'true duty of human birth' as defined in Chapter 8 of the Sai Satcharitra, and why is it considered so important?

According to the philosophical discourse in Chapter 8 of the Sai Satcharitra, the 'true duty of human birth is the attainment of the Supreme Self (Paramatman).' This is considered paramount because a life devoid of this pursuit is seen as wasted and equivalent to that of an animal. The chapter argues that if life is merely about physical sustenance and procreation, as it is for dogs and pigs, then the unique opportunity of a human body is squandered. The text emphasizes that a human being is meant to be 'free, fearless, and independent,' and that the 'realization of the Eternal is the true success of birth,' making this spiritual quest the ultimate purpose of our existence.