Can you summarize the main purpose and teachings of Chapter 48 of the Sai Satcharitra?

The main purpose of Chapter 48 is to answer a listener's question: "Is Shri Sai a Guru or a Sadguru?" To address this, the chapter provides a detailed list of characteristics that define a true Sadguru, so the reader may recognize these signs at the feet of Shri Sai. The core teaching is that a Sadguru is not identified by scriptural knowledge or external practices alone, but by their ability to grant direct spiritual experience. As explained throughout Chapter 48, a Sadguru is also marked by a complete lack of ego, treating all with equality and love, and a selfless desire to serve the disciple, rather than be served.