According to Chapter 4 of Sai Satcharitra, what are the primary reasons for a saint to take birth on Earth?

Chapter 4 of the Sai Satcharitra explains that saints incarnate primarily to address a decay in religion and morality. When people lose sight of the ultimate goal (Paramartha) and become obsessed with worldly sources of happiness like wealth, status, and family, saints appear to reawaken religious consciousness. Their arrival is a response to societal degradation, such as when religious teachers are insulted, sectarian hatred grows, and people ignore proper conduct. As described in this chapter, saints descend to this earth to protect the humble, the poor, and the weak, and to destroy irreligion, thus restoring balance and offering a path to self-upliftment for the distressed.