Chapter 16 contrasts the gift of a Guru with that of a 'Chintamani' or wish-fulfilling gem. Can you elaborate on this comparison based on the text?

Certainly. The comparison in Chapter 16 serves to highlight the supreme generosity and unique power of the Sadguru. The text explains that a 'Chintamani,' or wish-fulfilling gem, is limited because it can only bestow what a person thinks of or desires. Its power is confined to the realm of the seeker's own imagination and material or mental wants. In stark contrast, the Guru gives the 'Unthinkable Object,' which the chapter identifies as Brahman. This gift is beyond the disciple's capacity to even conceive of or ask for. Thus, as Chapter 16 wonderfully illustrates, the Guru's grace provides a transcendental reality that far surpasses the fulfillment of any worldly or mental desire.