What are some signs of someone who is NOT a true Sadguru, according to Chapter 48?

Chapter 48 provides several characteristics of individuals who should not be considered true Sadgurus. These include those who possess only vast verbal knowledge without the backing of self-experience, which the chapter calls 'verbally hollow.' Similarly, those who perform practices like controlling their breath (Pranayama) or wearing heated marks (Taptamudra) are not automatically Sadgurus. The chapter also cautions against those who give mantras to disciples without any certainty of when the spiritual fruit will be attained. Ultimately, as stated in Chapter 48, anyone who lacks direct personal experience and cannot impart it to a disciple should never be called a Sadguru.