How does Chapter 48 differentiate between a genuine Sadguru and individuals who are merely learned or perform religious practices?

According to the teachings in Chapter 48, wise men do not consider someone a Sadguru simply because they have studied the Vedas, know the six Shastras, or can explain Vedanta. The chapter explicitly states that those who control their breath, wear heated marks (Taptamudra), or please audiences with talks about Brahman without having self-experience are not true Sadgurus. Their knowledge is described as 'verbally hollow.' The key differentiator is that a genuine Sadguru is a giver of direct, full experience, whereas the others possess vast verbal knowledge but lack the essential 'taste of experience' needed to truly enlighten a disciple.