What are the main teachings and stories presented in Chapter 16 of the Sai Satcharitra?

Chapter 16 of the Sai Satcharitra focuses on the nature of the Sadguru and the ideal relationship between a Guru and a disciple. It teaches that the Guru is desireless ('Aptakama') and that his true role is to fulfill the devotee's desire for service, making them desireless in the process. The core teaching revolves around the necessity of complete surrender and faith, warning against pride and cleverness. As this chapter explains, the Guru imparts knowledge even while donning a "cloak of ignorance" to help the lowly. The ultimate reward for faithful service is union with Brahman (Sayujya). The chapter uses rich metaphors, describing the Guru's spiritual court and comparing his generosity favorably against a wish-fulfilling gem.