How does Chapter 4 characterize the nature of saints and their mission to uplift humanity?

According to Chapter 4, saints are depicted as beings who are already naturally liberated but choose to incarnate on Earth for the benefit of others. Their nature is selfless, as their incarnation has no self-interest and is solely to uplift the distressed. Their mission is to restore faith and righteousness. The chapter explains that they 'fill the foundation of Renunciation (Nivritti) and build the temple of Ultimate Truth,' which allows them to easily uplift devotees. Their work involves performing the duties of religion and awakening faith. Once their specific mission is fulfilled, they end their incarnation.