According to the Sai Satcharitra, what are the primary reasons a saint takes an incarnation on Earth?

Chapter 4 of the Sai Satcharitra explains that saints incarnate during times of significant societal and religious decay. Their arrival is prompted when people lose their way, when Brahmins despise their caste, religious teachers are insulted, and sectarian hatred grows. As the text details, saints also descend to this earth to protect the humble, the poor, and the weak. They come to awaken religion when people have lost the chance for ultimate well-being, acting as a corrective force to destroy irreligion and restore a righteous path.