What is the comprehensive definition of a Sadguru presented in Chapter 48 of the Sai Satcharitra?

Chapter 48 offers a comprehensive definition of a Sadguru by contrasting them with other types of teachers. The chapter establishes that a Sadguru is one who possesses not just vast verbal knowledge, but also the direct, full experience of the self, and has the authority to impart that experience to disciples. A key attribute is their complete lack of ego; they do not see themselves as superior but rather view the disciple as the Supreme Brahman with fatherly love. Furthermore, as described in Chapter 48, a true Sadguru does not seek service or livelihood from a disciple and is instead willing to sacrifice their own body for the disciple's benefit. Their presence is a storehouse of supreme peace where all are treated as equals.