How does Chapter 48 differentiate between a person with verbal knowledge and an authentic Sadguru?

According to the teachings in Chapter 48, the key difference lies in self-experience. The chapter explains that many can possess vast verbal knowledge, explain principles sweetly, or please audiences with talks about Brahman, but this is considered "verbally hollow" without direct experience. Such teachers might give mantras, but there is no certainty of when the disciple will attain the fruit. In contrast, an authentic Sadguru is described as one who not only has complete verbal knowledge but is also a "giver of direct, full experience." The text emphasizes that one who has no direct experience themselves cannot give anything to a disciple and should never be called a Sadguru.