What qualities or practices does Chapter 48 explicitly state are NOT sufficient to be considered a Sadguru?

In Chapter 48, it is clarified that certain abilities do not make one a Sadguru. The text explains that the wise do not consider those who merely study the Vedas, have knowledge of the six Shastras, or explain Vedanta as Sadgurus. Furthermore, practices like controlling the breath (Pranayama), wearing heated marks (Taptamudra), or pleasing audiences with talks about Brahman are insufficient. The chapter cautions that even giving mantras from scriptures is not a defining sign, especially if it is just hollow verbal knowledge without the backing of self-experience.