How does Chapter 16 of Sai Satcharitra contrast the gift from a Sadguru with the gift from a 'Chintamani' or wish-fulfilling gem?

Chapter 16 of the Sai Satcharitra draws a significant distinction to illustrate the supreme generosity of the Guru. It compares the Guru to a 'Chintamani,' a mythical wish-fulfilling gem. The text points out that the Chintamani is limited, as it can only give what a person thinks of or desires. In contrast, the Sadguru is described as the most generous giver in all three worlds because he bestows the 'Unthinkable Object,' which is Brahman, upon his devotee. This comparison in Chapter 16 powerfully conveys that while worldly means can fulfill limited, imaginable desires, only a Sadguru can grant the ultimate, transcendental state of realization, which is beyond the devotee's own conception.