Chapter 48 contrasts true Sadgurus with others. What kinds of teachers does the text say should not be considered Sadgurus?

Chapter 48 of the Sai Satcharitra provides a clear distinction between a true Sadguru and other teachers. The text explicitly states that wise men do not consider someone a Sadguru simply because they have studied the Vedas, know the six Shastras, or can explain Vedanta. Furthermore, the chapter cautions against those who only perform practices like controlling their breath (Pranayama) or wear heated marks (Taptamudra). Even those who please audiences with talks about Brahman but lack self-experience are not Sadgurus. Their knowledge is described as verbally hollow, and they cannot give the disciple what they do not possess themselves.