Based on the provided text, what is the true nature of Sai, and how should one approach understanding his greatness?

According to Chapter 50, Sai is described as 'purely an embodiment of consciousness; the Unmanifest itself has taken form.' His greatness is presented as unfathomable and beyond the power of speech to describe. The text suggests that any attempt to narrate his glory leads to the dissolution of pride in one's words. Therefore, Chapter 50 advises that it is better to approach the Guru's greatness with humility, 'like one who is mute, bowing the head at the Guru’s feet.' This implies that true understanding comes not from intellectual description but from reverent surrender and devotion.