According to Chapter 48 of Sai Satcharitra, what truly distinguishes a Sadguru from someone who merely possesses scriptural knowledge?

Chapter 48 of the Sai Satcharitra draws a clear line between a true Sadguru and those who only have theoretical knowledge. The text explains that simply studying the Vedas, explaining Vedanta, or controlling one's breath does not make one a Sadguru. The crucial difference is direct experience. The chapter states that someone with only verbal knowledge has a "total lack of self-experience," and such knowledge is considered "verbally hollow." A genuine Sadguru is described as a "giver of direct, full experience" who has the authority to enlighten disciples because they possess this profound, personal realization, which is something a person without it cannot possibly impart.