Chapter 48 identifies several types of spiritual teachers who should not be considered Sadgurus. Can you describe them?

According to the teachings in Chapter 48, wise individuals do not consider all spiritual teachers to be Sadgurus. The text explicitly mentions that those who only possess knowledge of the Vedas or the six Shastras are not necessarily Sadgurus. Similarly, those who control their breath (Pranayama), wear heated marks (Taptamudra), or simply please audiences with talks about Brahman fall short of this title. The chapter also cautions against those who give mantras but offer no certainty of results, and those whose vast verbal knowledge is hollow due to a complete lack of self-experience.