Can you explain the allegorical descriptions used for the Sadguru in Chapter 16, such as the "sword of Knowledge" and comparison to a "wish-fulfilling gem"?

Chapter 16 employs rich allegories to describe the Sadguru's power and generosity. The "sharp blade of the sword of Knowledge" is mentioned, and it is said that the mere sight of His hand raised to strike causes the "tree of worldly existence" to tremble in fear, symbolizing the Guru's power to destroy worldly attachments. The chapter also contrasts the Guru with a "wish-fulfilling gem" (Chintamani). While the gem can grant whatever is thought of, the Guru is far superior because He gives the "Unthinkable Object," which is Brahman, to His devotee. This highlights the Guru's role in bestowing the ultimate spiritual realization, which is beyond material or even imaginable desires.