What does Chapter 16 of Sai Satcharitra reveal about the nature and purpose of a Sadguru?

Chapter 16 portrays the Sadguru as a supremely generous being, the 'King of Yogis' who has taken a physical body to uplift the poor and lowly. The chapter explains that a Sadguru is always 'Aptakama' (one whose desires are fulfilled), and their purpose is to fulfill the disciple's desire for service, ultimately making the disciple desireless. Unlike a wish-fulfilling gem that grants what is asked, the Guru gives the 'Unthinkable Object,' which is Brahman itself. As described in Chapter 16, the Sadguru's primary function is to guide the devotee towards ultimate spiritual realization by imparting knowledge and providing a path to union with Brahman through faithful service.