Can you summarize the purpose and nature of saints as described in the fourth chapter of Sai Satcharitra?

Chapter 4 explains that saints are naturally liberated beings who incarnate on earth purely for the sake of others, with no self-interest involved. Their primary purpose is to uplift the distressed, protect the humble, the poor, and the weak, and to destroy irreligion. As detailed in the text, they come to re-establish the system of castes and stages of life when it has decayed. The chapter emphasizes that their mission is to awaken religion and faith in people who have lost their way, and once this specific work is fulfilled, they conclude their incarnation.