What are the key characteristics of a Sadguru as outlined in Chapter 48 of the Shri Sai Satcharitra?

Chapter 48 of the Shri Sai Satcharitra provides a detailed list for identifying a true Sadguru. The primary characteristic is that a Sadguru must possess direct, full self-experience, not just hollow verbal knowledge. Beyond this, a Sadguru is defined by their selflessness and humility. The chapter states they are free from ego, have fatherly love for the disciple, and would sacrifice for them rather than seek service. A Sadguru's abode is a place of supreme peace, where there is no pride in scholarship and where the small and the great are treated with absolute equality.