What does Chapter 4 say about the selfless nature and purpose of saints like Sai Baba?

As described in Chapter 4, the incarnation of saints is purely for the sake of others, as they themselves are naturally liberated and have no self-interest. Their mission is to uplift the distressed, protect the humble, poor, and weak, and destroy irreligion. They work to restore the system of castes and stages of life when it has fallen into decay. The text beautifully states that saints fill the foundation of Renunciation (Nivritti) to build the temple of Ultimate Truth, and around the frame of Worldly Activity (Pravritti), they easily uplift their devotees. Their entire purpose is to perform the work of religion and awaken faith, and once their specific work is fulfilled, they end their incarnation.