According to Chapter 48 of Sai Satcharitra, what are the primary differences between a regular Guru and a true Sadguru?

Chapter 48 of the Sai Satcharitra addresses a listener's question about this distinction by outlining what a Sadguru is not. Simply having knowledge of Vedas or Shastras, explaining Vedanta, or giving talks on Brahman does not make one a Sadguru. The text clarifies that while some teachers offer mantras and vast verbal knowledge, it is often 'verbally hollow' due to a lack of self-experience. In contrast, a true Sadguru is defined as one who possesses both complete verbal knowledge and the authority to enlighten disciples through the gift of direct, full experience. It is this ability to manifest the 'taste of experience' that truly defines a Sadguru.