What are the key characteristics of a true Sadguru as described in Chapter 48 of the Sai Satcharitra?

Chapter 48 of the Shri Sai Satcharitra addresses a listener's query about the nature of a Sadguru. It clarifies that a true Sadguru is not defined by mere scriptural knowledge, breath control, or pleasing talks. The defining quality is the combination of complete verbal knowledge with direct, full self-experience. As this chapter states, a Sadguru is one who can give this direct experience to a disciple. Furthermore, a Sadguru is free from ego, sees the disciple as the Supreme Brahman with fatherly love, and would sacrifice their own body for the disciple's sake, never desiring service or livelihood from them.