Why does the author struggle to describe Sai Baba's greatness, and what compels him to try anyway?

The author explains in Chapter 49 that Sai Baba's greatness is inexpressible and that even the Vedas and Puranas grew weary trying to praise the Sadguru. He notes that the highest forms of speech return from the attempt, making the spoken word inadequate. However, he cannot remain silent because the bliss of experiencing Sai's divine play, or Leela, is too profound to keep to himself. He compares this experience to a sweet delicacy that tastes bland if not shared with friends, and this desire to share the bliss with fellow listeners is what compels him to write.