According to Chapter 16, what is the ultimate role of the Sadguru in a disciple's quest for Brahman, and how does this relationship transcend simple wish-fulfillment?

Chapter 16 delves into the profound role of the Sadguru in guiding a disciple to the ultimate reality, or Brahman. The text states that the most effective path is for the disciple to completely surrender, as the Guru knows the disciple's hidden pitfalls and provides remedies. While a wish-fulfilling gem (Chintamani) can grant what is thought of, this chapter explains that the Guru's gift is far superior; he gives the "Unthinkable Object," which is Brahman itself. The Sadguru is described as Aptakama (one whose desires are already fulfilled), so his purpose is not to receive from the disciple but to fulfill the disciple's desire for service and ultimately make them desireless by granting union with the Absolute (Sayujya).