What does Chapter 4 reveal about the selfless nature and primary purpose of a saint's incarnation on Earth?

Chapter 4 of the Sai Satcharitra emphasizes that saints are naturally liberated beings whose incarnation is purely for the sake of others, as they have no self-interest. Their primary purpose is to uplift the distressed, protect the humble, poor, and weak, and destroy irreligion. They descend to Earth to awaken religion when people have lost their chance for ultimate well-being due to spiritual decay. Their mission, as described in this chapter, is to guide devotees and restore the system of castes and stages of life for the betterment of humanity.