What are the primary characteristics of a true Sadguru as outlined in Chapter 48 of the Sai Satcharitra?

Chapter 48 of the Shri Sai Satcharitra explains that a true Sadguru is defined by more than just scriptural knowledge. A Sadguru is one who possesses both complete verbal knowledge and is also a giver of direct, full self-experience. They have the authority to enlighten disciples because they have this direct experience themselves. As highlighted in this chapter, a Sadguru is free from ego, never sees a disciple as insignificant, and instead considers the disciple as the Supreme Brahman with fatherly love. They are willing to sacrifice their own body for the disciple's sake and do not desire their own livelihood from them.