What is the purpose of the invocation and the call to meditation at the beginning of Chapter 20?

The start of Chapter 20 serves to set a devotional and contemplative tone. It begins with traditional salutations and an invocation to the Guru, likening him to the Manasa lake. The text then explicitly invites the reader to meditate on Sai Baba and mentally travel to Shirdi. It suggests visualizing the scene after the noon Aarti to feel Baba's presence, stating that through 'the power of firm meditation,' past events 'become visible.' This serves as a spiritual preparation, encouraging the reader to connect with Sai's presence before delving into the chapter's main story about Das Ganu.