According to Chapter 16, what is the ultimate role of a Sadguru, and how does he surpass other givers like a 'Chintamani'?

Chapter 16 presents the Sadguru as the most generous giver in all three worlds, whose ultimate purpose is to guide disciples to liberation. It asserts that serving the Guru with unwavering faith is the direct path to attaining union with Brahman (Sayujya), a state that other spiritual means fail to achieve. The chapter draws a powerful comparison to a wish-fulfilling gem, or Chintamani, which can only grant what is thought of or desired. In contrast, the Sadguru miraculously gives his devotee the "Unthinkable Object," which is Brahman itself, a reality far beyond the scope of worldly or even celestial boons.