Chapter 48 criticizes teachers with 'verbally hollow' knowledge. What does this phrase imply, and what essential quality must a Sadguru possess that contrasts with this?

In Chapter 48, 'verbally hollow' knowledge refers to teachings from those who possess vast scriptural knowledge and can speak sweetly on principles but lack personal self-experience. Their explanations might seem correct, but they cannot impart true realization. The essential quality a Sadguru must possess, in stark contrast, is the ability to be a 'giver of direct, full experience.' The chapter strongly emphasizes this point, stating that someone without direct experience themselves has nothing to give a disciple and should never be called a Sadguru. Therefore, the authority of a Sadguru is rooted not just in knowledge, but in the profound ability to manifest and transmit direct experiential wisdom.