Can you explain the meaning of the Sadguru being 'Aptakama' as mentioned in Chapter 16 and its implication for a disciple?

In Chapter 16, the term 'Aptakama' is used to describe the Sadguru, signifying that he is one whose desires are always fulfilled and who is inherently complete. The implication for a disciple is profound: one cannot give the Guru anything he needs. Instead, the chapter clarifies that the Sadguru fulfills the disciple's own desire to perform service, thereby using the act of service as a tool to make the disciple themselves desireless. The service is not for the Guru's benefit, but for the spiritual purification and progress of the devotee.