What is the primary topic discussed in Chapter 48 of the Shri Sai Satcharitra, and how does it define a true spiritual master?

Chapter 48 of the Shri Sai Satcharitra primarily addresses a listener's question about whether Shri Sai is a Guru or a Sadguru. To provide clarity, the chapter details the characteristics of a true Sadguru. It explains that a Sadguru is not merely someone with scriptural knowledge, one who can control their breath, or an individual who gives pleasing talks. As detailed in this chapter, a true Sadguru is one who possesses direct, full self-experience and has the authority to impart that enlightenment to a disciple. This master is free from ego, has fatherly love for the disciple, and wishes to sacrifice their own body for the disciple's sake, never desiring service or livelihood in return.