Why is it considered a transgression to leave Shirdi without Baba's permission, and how does the Udi fit into this process?

Chapter 35 explains that leaving Shirdi is not up to an individual's own will. Transgressing Baba's command by leaving without permission is said to be an "invitation to obstacles," leading to "remorse and humiliation" and "dreadful interruptions" on the way. The entire process of arrival and departure is under Sai's control. The Udi plays a critical role in this formal process. After a devotee bows and asks for permission, the act of receiving the Udi along with a blessing serves as the official, sanctioned permission to leave, ensuring a safe and blessed journey.