What does Chapter 16 say about the Sadguru's nature as 'Aptakama' and his reasons for accepting service from devotees?

According to Chapter 16, the Sadguru is described as 'Aptakama,' which means one whose desires are already fulfilled. He does not require anything from a disciple. The text clarifies that when a Guru accepts service, it is not for his own fulfillment but for the benefit of the devotee. As stated in Chapter 16, the Sadguru fulfills the disciple's desire to serve, and in doing so, helps the disciple on the path to becoming desireless themselves. This act of acceptance is a form of grace to aid the spiritual progress of the follower.