According to Chapter 48, what are some traits of individuals who are often mistaken for Sadgurus but are not considered so by the wise?

Chapter 48 of the Shri Sai Satcharitra cautions against mistaking certain practitioners for true Sadgurus. The text specifies that those who merely study the Vedas, possess knowledge of the six Shastras, or explain Vedanta are not automatically Sadgurus. It further identifies those who practice breath control (Pranayama), wear heated marks (Taptamudra), or give pleasing talks on Brahman without deep, personal experience. The chapter also points out that giving disciples mantras to chant without any certainty of the outcome is a sign of a teacher who lacks the authentic spiritual authority of a genuine Sadguru, whose knowledge must be rooted in self-experience.