How does Chapter 4 explain the mission of a saint and their relationship with both worldly activity (Pravritti) and renunciation (Nivritti)?

Chapter 4 of the Sai Satcharitra provides a profound look into a saint's purpose. It states that their incarnation is selfless, intended to uplift the distressed. The chapter explains that saints fill the foundation of Renunciation (Nivritti) and, upon that base, build the temple of Ultimate Truth. They use the framework of worldly activity (Pravritti) to easily uplift their devotees. Their core mission is to perform the work of religion and awaken faith in the populace. Once this specific work is fulfilled, as the text mentions, they conclude their incarnation, having completed their divine purpose.