Based on Chapter 48, what are the defining characteristics of a true Sadguru?

According to Chapter 48 of the Sai Satcharitra, a true Sadguru is defined not by superficial qualities but by profound inner realization and attitude. The text explains that a Sadguru is one who possesses both complete verbal knowledge and, more importantly, the ability to give direct, full experience to their disciples. They are free from the ego of seeing themselves as superior, instead considering the disciple as the Supreme Brahman with fatherly love. A Sadguru is described as a storehouse of supreme peace, treats the small and great as equals, and never desires service or livelihood from a disciple, even being willing to sacrifice their own body for the disciple's sake.