From a spiritual perspective, what principle does the text teach about a disciple's duty when receiving Prasad from their Guru, even if it seems inappropriate?

The text outlines a critical spiritual principle regarding the Guru-disciple relationship. Chapter 38 states that when a Guru offers Prasad, a disciple who entertains doubts about what is edible or inedible suffers a form of "spiritual suicide" and heads towards a downfall. The story of Dada Kelkar being asked to fetch meat is presented as a practical lesson from Baba to make his devotees experience this very principle. It underscores the idea that the most important 'Dakshina' is not a material offering but the unwavering execution of the Guru's command, which is the truest way to please the Guru.