How does Chapter 48 differentiate between a guru with mere verbal knowledge and a true Sadguru?

Chapter 48 of the Sai Satcharitra draws a sharp distinction between a teacher with only verbal knowledge and a true Sadguru. It describes those with only verbal knowledge as having a "verbally hollow" understanding, even if their explanations of principles are sweet and their knowledge seems vast. They may give mantras and instructions, but there is no certainty of results because they lack self-experience. As the chapter explains, a true Sadguru is one who not only possesses complete verbal knowledge but is also a "giver of direct, full experience." The text asserts that someone without personal experience cannot impart it to a disciple and should never be called a Sadguru.