According to Chapter 48, what are some qualities or practices that do NOT automatically make someone a Sadguru?

Chapter 48 cautions that certain attributes are insufficient to qualify someone as a Sadguru. The wise do not consider those who merely study the Vedas, have knowledge of the six Shastras, or explain Vedanta to be Sadgurus. Similarly, practices like controlling the breath (Pranayama) or wearing heated marks (Taptamudra) are not defining signs. As the chapter states, even those who please audiences with talks about Brahman or give out mantras but lack self-experience have knowledge that is considered "verbally hollow" and should not be called a Sadguru.