What is the context for the discussion on the characteristics of a Sadguru at the beginning of Chapter 48?

The discussion on the nature of a Sadguru is presented at the start of Chapter 48 to directly address a question that arose in a listener's mind. As the chapter begins, it notes that a listener wondered whether Shri Sai should be considered a Guru or a Sadguru. To provide satisfaction and clarity on this matter, the author decided to mention the brief characteristics of a Sadguru. The stated goal, as mentioned in Chapter 48, is to demonstrate how the signs of a Sadguru can be found at the feet of Shri Sai Samarth, thereby establishing his elevated spiritual status beyond any doubt.