How does Chapter 4 describe the selfless mission of saints and their relationship to worldly life versus ultimate truth?

Chapter 4 explains that saints are already liberated and their incarnations are purely for the sake of others, with no personal self-interest. Their mission is to uplift the distressed and protect the weak. The text uses a powerful metaphor, stating that saints fill the foundation of Renunciation (Nivritti) and build upon it the temple of Ultimate Truth. Simultaneously, they use the frame of Worldly Activity (Pravritti) to easily uplift their devotees. As Chapter 4 clarifies, they work to restore religion and awaken faith, and once their specific task is complete, they end their incarnation, having guided people back toward the ultimate goal.