According to Chapter 48, what are some attributes that do not necessarily define a true Sadguru?

Chapter 48 of the Sai Satcharitra clarifies that several qualities often associated with spiritual teachers do not, by themselves, qualify someone as a Sadguru. The text explains that wise men do not consider individuals Sadgurus simply because they have studied the Vedas, mastered the six Shastras, or can explain the Vedanta. Furthermore, practices like controlling the breath (Pranayama) or delivering pleasing talks about Brahman are also insufficient. This chapter emphasizes that such teachers may possess extensive verbal knowledge but lack the crucial element of direct self-experience, which is the defining characteristic of an authentic Sadguru.