What was the significance of receiving Udi when a devotee was leaving Shirdi, based on the information in Chapter 33?

Chapter 33 of the Shri Sai Satcharita highlights a specific and important custom related to devotees departing from Shirdi. When devotees would ask for Sai Baba's permission to return to their villages, he would give them Udi. This act was universally understood by all devotees as the true sign of his consent. The text states that when Baba said, 'Take the Udi,' true permission was granted, and this would fill the devotee's mind with enthusiasm for their journey. Therefore, receiving the Udi upon departure was more than just a blessing; it was Baba's explicit and encouraging approval for the devotee to leave.