What is the primary message of Chapter 4 in Sai Satcharitra regarding the purpose of a saint's incarnation?

Chapter 4 of Sai Satcharitra explains that saints take an incarnation on Earth during times of significant moral and religious decay. Their purpose is entirely selfless, aimed at uplifting humanity. As detailed in the chapter, saints descend when people disrespect religious teachers, ignore proper conduct, and become obsessed with worldly pleasures over spiritual goals. They come to protect the humble and weak, destroy irreligion, and re-establish faith. Chapter 4 emphasizes that their incarnation is purely for the sake of others, as they are already liberated beings with no self-interest, and they depart once their specific mission of awakening is fulfilled.