How does Chapter 4 describe the selfless nature and ultimate purpose of a saint's incarnation?

Chapter 4 of the Sai Satcharitra details that saints are naturally liberated beings who incarnate purely for the sake of others, with no self-interest. Their mission is to uplift the distressed and protect the humble, poor, and weak. The text describes their work as building the 'temple of Ultimate Truth' upon the 'foundation of Renunciation' and uplifting devotees within the framework of worldly activity. As stated in this chapter, their purpose is to perform the work of religion, awaken faith, and destroy irreligion. Once this specific mission is fulfilled, they conclude their incarnation.