What is the spiritual consequence for a disciple who doubts the Guru's Prasad, and how did Baba teach this lesson?

According to the teachings in Chapter 38, a disciple who entertains doubt about the Guru's Prasad, questioning what is edible or inedible, commits a grave error. This act is described as a form of 'spiritual suicide' that leads toward the disciple's downfall. Baba illustrated this very principle through His interactions with devotees, such as the incident with Dada Kelkar. To teach the importance of faith over doubt, Baba would sometimes use jokes and humor to make His devotees experience this lesson directly, as narrated in the text.