According to Chapter 48, what are the primary qualities that define a true Sadguru?

Chapter 48 of the Sai Satcharitra outlines the essential characteristics of a true Sadguru to help a listener understand Sai Baba's stature. A Sadguru is not defined by mere scriptural knowledge, the ability to explain Vedanta, or performing practices like Pranayama. The most crucial quality, as emphasized in this chapter, is having direct self-experience and the ability to impart that experience to a disciple. Furthermore, a Sadguru is free from ego, treats the small and great equally, harbors a fatherly love for the disciple, and never desires service or livelihood from them, instead being willing to sacrifice their own body for the disciple's sake.