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

According to the teachings in Chapter 48, a true Sadguru is defined by several profound qualities. A Sadguru is one who not only possesses complete verbal knowledge but is also a giver of direct, full experience to the disciple. They are entirely free from egoism and do not consider themselves superior, instead viewing the disciple as a form of the Supreme Brahman with fatherly love. As described in this chapter, a Sadguru does not seek service from a disciple but is willing to sacrifice for them, and they do not desire their livelihood from their followers. Furthermore, their abode is a place of supreme peace where they treat the small and the great as equals, without any pride in their own scholarship.