Based on Shri Sai's experience with his own Guru as described in Chapter 19, what was the primary form of devotion or service his Guru expected?

According to Chapter 19, the primary devotion Shri Sai's Guru expected was not material service but one of intense, unwavering contemplation and love. Although Sai mentions he "wore myself out serving him," the core expectation is revealed in his description of their relationship. Sai states, "I would gaze at my Guru's face with love day and night; I felt neither hunger nor thirst." He clarifies that this constant focus was the true goal: "There was no meditation without him, no other goal; he was my only constant contemplation... This was all my Guru expected; he desired nothing more than this." The Guru's request for the "two paise" of Faith and Patience further reinforces that the expectation was for inner qualities, not external acts.