What does Chapter 16 of Sai Satcharitra say about the role and nature of a Sadguru?

According to Chapter 16 of Sai Satcharitra, the Sadguru is described in magnificent terms. He is considered the 'King of Yogis' who has taken a physical body specifically to help others and uplift the poor and lowly. The text explains that a Sadguru is 'Aptakama,' meaning his own desires are always fulfilled, and his primary role is to fulfill the disciple's desire for service, ultimately making the disciple desireless. Chapter 16 further illustrates the Guru's unparalleled generosity by comparing him to a wish-fulfilling gem, noting that while the gem grants what is thought of, the Guru gives the 'Unthinkable Object,' which is Brahman, to his devotee.