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

Chapter 48 of the Sai Satcharitra explains that a true Sadguru is far more than just a scholar. While some may have knowledge of the Vedas or be able to explain Vedanta, the wise do not consider them Sadgurus based on this alone. The chapter clarifies that a Sadguru is one who possesses both complete verbal knowledge and is also a "giver of direct, full experience" to the disciple. Those who have vast knowledge but lack self-experience are described as "verbally hollow," whereas a true Sadguru can manifest the pure taste of experience, which is the key differentiator.