Can you explain the fundamental nature and purpose of saints as described in the fourth chapter?

The fourth chapter of Sai Satcharitra describes saints as beings who are naturally liberated and incarnate on Earth purely for the benefit of others, having no self-interest. Their purpose is to restore order and spirituality when it has been lost. As detailed in Chapter 4, they descend to protect the system of castes and stages of life, destroy irreligion, and protect the humble, poor, and weak. Their mission is to uplift the distressed and awaken religion, especially when people have turned away from the ultimate goal in favor of worldly pursuits like wealth and status.