The introduction to Chapter 32 mentions a story that Baba told himself. What is that story about and why is it considered so important?

Chapter 32 builds anticipation for a particularly special story that Sai Baba narrated from his own mouth. The story is about a personal experience he had of an unexpected 'Guru-darshan' while he was in the forest. This narration is considered a 'supreme wonder' and is described as being extremely beneficial to listeners. Its importance, as highlighted in Chapter 32, lies in its power to grant devotion, faith, and liberation. Because the words come directly from Sai's mouth, they are said to have the purifying power to destroy sins and afflictions, akin to the sight of the Ganga, and to help devotees perceive their own Guru.