How does Chapter 48 distinguish a Sadguru from other spiritual teachers who may have extensive scriptural knowledge?

Chapter 48 draws a clear distinction between a true Sadguru and other teachers. It states that merely studying the Vedas, knowing the six Shastras, or explaining Vedanta does not make one a Sadguru. The text criticizes teachers whose knowledge is purely verbal and lacks self-experience, describing it as 'verbally hollow.' While they might give sweet explanations or offer mantras, there is no certainty of results. In contrast, Chapter 48 emphasizes that a Sadguru is someone who has direct, full experience and has the authority to enlighten disciples by manifesting that experience for them. A person who lacks this direct experience should never be called a Sadguru, regardless of their verbal knowledge.