According to Chapter 4, why do saints like Sai Baba choose to incarnate on Earth?

Chapter 4 of the Shri Sai Satcharitra explains that saints incarnate when there is a significant decay of religion and righteousness in the world. They descend to the mortal realm to protect the humble, the poor, and the weak, and to destroy irreligion. This chapter clarifies that saints themselves are naturally liberated, but they take on a physical form purely for the sake of others, with no self-interest involved. Their purpose is to awaken faith, restore the principles of religion, and uplift the distressed who have turned away from their ultimate spiritual goal.