What kinds of teachers does Chapter 48 explicitly state are NOT considered Sadgurus by the wise?

In its exploration of the nature of a true spiritual master, Chapter 48 begins by clarifying who should not be considered a Sadguru. According to the text, the wise do not confer this title upon those who simply have knowledge of the Vedas or the six Shastras. Similarly, individuals who only explain Vedanta, control their breath through Pranayama, wear heated marks (Taptamudra), or please crowds with talks about Brahman do not meet the criteria. This chapter emphasizes that such external knowledge or practices, without the backing of direct experience, are insufficient for one to be called a Sadguru.