What specific traits are mentioned in Chapter 48 as not being sufficient to identify a Sadguru?

Chapter 48 of the Shri Sai Satcharitra is very clear in listing several attributes that, by themselves, are insufficient to qualify someone as a true Sadguru. The text cautions readers against being misled by superficial or purely intellectual qualities. According to Chapter 48, the study of Vedas, knowledge of the six Shastras, or the ability to explain Vedanta does not make one a Sadguru. Similarly, practices such as breath control (Pranayama) or wearing heated marks (Taptamudra) are not definitive signs. Even the ability to please an audience with charming talks about Brahman or giving out mantras from scriptures is dismissed as potentially 'verbally hollow' if not backed by direct experience.