What are the core teachings presented in Chapter 48 of the Sai Satcharitra about identifying a true Sadguru?

Chapter 48 of the Shri Sai Satcharitra provides a detailed explanation to help listeners distinguish between a genuine Sadguru and others. The chapter teaches that a Sadguru is not defined by external knowledge, such as the study of Vedas or the ability to explain Vedanta. Instead, a true Sadguru is characterized by their own direct self-experience and their capacity to impart that experience to their disciples. As the text states, knowledge without this experiential component is merely "verbally hollow." Furthermore, a Sadguru is free from ego, treats the small and great equally, and feels a fatherly love for the disciple, wishing to serve them rather than be served.