Chapter 48 mentions certain practices that do not necessarily make someone a Sadguru. Can you elaborate on what these are and why they are insufficient?

Indeed, Chapter 48 of the Sai Satcharitra cautions listeners against mistaking certain outward practices for signs of a true Sadguru. The text mentions that individuals who control their breath (Pranayama), wear heated marks (Taptamudra), or deliver pleasing talks about Brahman are not automatically Sadgurus. Similarly, those who only give mantras from scriptures are not guaranteed to be enlightened masters. The reason these are insufficient, as the chapter explains, is the potential 'total lack of self-experience.' Their knowledge can be 'verbally hollow.' A true Sadguru, in contrast, must possess and be able to grant direct, full experience, which is the ultimate test of their authority.