According to Chapter 16, how does the gift of a Sadguru surpass that of a wish-fulfilling gem, or Chintamani?

Chapter 16 draws a powerful distinction between a Sadguru and a Chintamani. The text explains that a Chintamani, or wish-fulfilling gem, is limited to granting only what a person can think of or desire. Its power is bound by the seeker's imagination. In contrast, the Sadguru's gift is infinitely superior because He gives the 'Unthinkable Object,' which is identified as Brahman. As Chapter 16 wonderfully illustrates, this ultimate reality is beyond the scope of ordinary thought and worldly desire, making the Guru's grace the most profound and transformative boon a devotee can receive.