How does Chapter 16 contrast the gift of a Sadguru with that of a wish-fulfilling gem (Chintamani)?

In Chapter 16, a powerful comparison is made to highlight the unparalleled generosity of a Sadguru. The text points out that a wish-fulfilling gem, or Chintamani, is limited because it can only bestow what a person thinks of or desires. The Sadguru's gift, however, transcends this completely. As Chapter 16 wonderfully states, the Guru gives his devotee the "Unthinkable Object," which is identified as Brahman. This signifies that the Guru provides a state of ultimate spiritual realization that is beyond the scope of worldly thought and desire, making his gift infinitely more valuable and profound than any material or imagined treasure.