How does Chapter 4 describe the selfless mission of saints and their relationship with 'Nivritti' and 'Pravritti'?

Chapter 4 portrays saints as naturally liberated beings who incarnate purely for the sake of others, with no self-interest. Their mission is to uplift the distressed and restore religion. The text uses a powerful metaphor, explaining that saints "fill the foundation of Renunciation (Nivritti) and build the temple of Ultimate Truth." Around this, they use the "frame of Worldly Activity (Pravritti)" to easily uplift their devotees. This implies they work within the world to guide people towards detachment and spiritual awakening. As described in this chapter, once their specific work of awakening faith is fulfilled, they end their incarnation.