From the perspective of Chapter 49, explain why the Sadguru's nature is considered inexpressible.

Chapter 49 posits that the Sadguru's nature is inexpressible because it transcends the limits of human comprehension and language. The author notes that Sai's Leela is "inexpressible" and his art is "inconceivable." The text delves into the philosophy of speech, mentioning that where the transcendental speech (Para) returns and the middle stages (Pashyanti, Madhyama) do not even open their mouths, the spoken word (Vaikhari) is utterly powerless. This illustrates that the Sadguru's essence exists beyond the realm of articulation. Therefore, the only way to grasp the Sadguru's true form is not through description but through complete surrender at His feet and obtaining His grace.