Chapter 49 mentions different stages of speech to explain the inexpressible nature of the Sadguru. Can you elaborate on this concept using the details from the text?

Chapter 49 explains that the Sadguru's greatness is beyond description by referencing four stages of speech. The text states that the Guru's true nature is a realm from which even "Para" (transcendental speech) returns, unable to grasp it. It follows that the subsequent, less subtle stages, "Pashyanti" and "Madhyama" (the middle stages of speech), also cannot articulate this reality. Given that these three higher forms of speech are ineffective, the chapter rhetorically asks what the fourth and most gross form, "Vaikhari" (the spoken word), could possibly achieve. This framework powerfully illustrates that the Sadguru is fundamentally inconceivable and inexpressible through any form of human or divine language.