What are the main teachings presented in Chapter 11 of the Sai Satcharitra regarding Sai Baba's powers and the role of a Guru?

Chapter 11 of the Sai Satcharitra introduces several key teachings, focusing on the greatness of Sai Baba and the importance of a Guru. It highlights Baba's authority over the five elements of nature, suggesting that figures like Indra and Agni obey his commands. The chapter strongly emphasizes the necessity of devotion to a Saguna, or manifest, Guru. It posits that for a devotee who has a physical body, a Guru in a physical form is essential for devotion to truly manifest and for spiritual progress to occur, as detailed throughout this chapter.