How does Chapter 4 characterize the fundamental nature of saints and their mission in the world?

Chapter 4 of the Sai Satcharitra portrays saints as beings who are already naturally liberated, yet they are always ready to uplift the distressed. Their incarnation is described as being purely for the benefit of others, devoid of any self-interest. Their mission is to build the 'temple of Ultimate Truth' upon the 'foundation of Renunciation.' They work within the 'frame of Worldly Activity' to easily uplift devotees, perform the work of religion, and awaken faith. The chapter concludes this point by stating that once their specific work is fulfilled, they end their incarnation, having completed their selfless mission.