What is the central theme of Chapter 16 regarding the nature of the Sadguru and the path of a disciple?

Chapter 16 describes the Sadguru as a "King of Kings" seated on a throne of peace, whose splendor is sung by the Vedas, Shastras, and Puranas. It teaches that the Sadguru is desireless and accepts offerings made with sincere faith, not pride. For the disciple, the path to union with Brahman (Sayujya) is through humble service and complete surrender to the Guru. The chapter warns against using "cleverness" and stresses that firm faith at the Guru's feet is essential, as the Guru provides remedies for pitfalls the disciple isn't even aware of.