Based on Chapter 4, what is the ultimate mission of saints, and how do they go about fulfilling it?

The teachings in Chapter 4 of the Sai Satcharitra state that the ultimate mission of a saint is to perform the work of religion and awaken faith. They accomplish this by building the 'temple of Ultimate Truth' on the 'foundation of Renunciation (Nivritti)'. The text explains that they skillfully operate within the 'frame of Worldly Activity (Pravritti)' to easily uplift their devotees. Their work is entirely for the benefit of others, and once this specific mission to restore righteousness is fulfilled, they conclude their incarnation.