What specific qualities or actions does Chapter 48 identify as insufficient for a person to be considered a true Sadguru?

In its exploration of what constitutes a Sadguru, Chapter 48 explicitly lists several characteristics that are not sufficient on their own. The text states that wise men do not call someone a Sadguru just because they have studied the Vedas or the six Shastras. Similarly, practices like controlling the breath (Pranayama), wearing heated marks (Taptamudra), or delivering pleasing talks about Brahman are not defining signs. Even the act of giving disciples mantras to chant is questioned, as there is no certainty of the outcome. The core message of the chapter is that vast verbal knowledge without the "taste of experience" is hollow and does not qualify one as a Sadguru.