Chapter 16 claims the Guru gives the "Unthinkable Object." What does this mean, and how is it superior to other gifts?

According to Chapter 16, the "Unthinkable Object" that the Guru gives is Brahman, the ultimate, formless reality. This gift is presented as far superior to what even a wish-fulfilling gem, or Chintamani, can provide. The chapter explains that a Chintamani can only grant what is thought of or desired by the mind. However, the Sadguru generously bestows the "Unthinkable Object," which transcends mental concepts and worldly desires. It is through humble service to the Guru, not other means, that a disciple can attain this state of union with Brahman (Sayujya), highlighting the unparalleled nature of the Guru's gift.