According to Chapter 48 of the Sai Satcharitra, what are the defining qualities of a true Sadguru?

Chapter 48 of the Sai Satcharitra provides a detailed description of a true Sadguru. A Sadguru is defined not by mere scriptural knowledge, but by the ability to provide direct, full experience to a disciple. This chapter explains that a Sadguru is free from ego, viewing the disciple as the Supreme Brahman with fatherly love. They are a storehouse of supreme peace, treat the small and great as equals, and would rather sacrifice their own body for a disciple than receive service from them. Such a master does not desire their own livelihood from the disciple and is considered the most superior in the world.