According to Chapter 48 of Sai Satcharitra, what defines a true Sadguru, and what are their primary characteristics?

Chapter 48 of the Shri Sai Satcharitra explains that a true Sadguru is defined by more than just scriptural knowledge. The key characteristic is the ability to provide direct, full experience to a disciple, not just hollow verbal knowledge. A Sadguru possesses both complete verbal understanding and is a giver of this direct experience. As this chapter describes, they are also benefactors free from ego, who consider the disciple as Supreme Brahman with fatherly love. The place of a Sadguru is a storehouse of supreme peace where the small and the great are treated as equals.