According to Chapter 4 of Sai Satcharitra, why do saints decide to incarnate on Earth?

Chapter 4 of the Sai Satcharitra explains that saints incarnate on Earth during times of significant moral and religious decay. Their arrival is prompted by conditions where religion is disrespected, societal order breaks down, and people become lost in worldly pursuits, forgetting the ultimate goal of life. As the text describes, saints descend to protect the humble and weak, destroy irreligion, and re-establish the foundations of faith. Their incarnation is not for any personal gain, as they are already liberated souls; it is a selfless act purely for the sake of uplifting others and awakening religion when it has declined.