According to Chapter 16, what is the nature of the Sadguru's desires and how does this affect his acceptance of a disciple's service?

Chapter 16 explains that a Sadguru is always 'Aptakama,' meaning his desires are already fulfilled, so a disciple cannot truly satisfy any need for him. The purpose of service, therefore, is for the disciple's own benefit. The Sadguru fulfills the disciple's desire to serve, which in turn helps the disciple become desireless. The chapter makes it clear that the Guru accepts a simple leaf or flower offered with faith and love, but will turn away from any offering made with pride, showing that sincere devotion is valued far more than the offering itself.