What was the significance of Mule Shastri seeing his Guru Gholap in Sai Baba?

The experience of Mule Shastri was profoundly significant as it shattered his preconceived notions and revealed the universal nature of Sai Baba. Mule, a first-born Brahmin learned in the Vedas, was initially doubtful about Baba. As recounted in Chapter 12, his pride of caste and adherence to ritual purity created a barrier. When he entered the Masjid, he saw his own revered Guru, Gholap Swami, instead of Baba. This vision caused him to immediately cast off his pride and embrace his Guru's feet, his ideas of touchable and untouchable vanishing. When the vision ended and he saw Baba asking for Dakshina, Mule had a profound realization. Chapter 12 states that the doubt in his mind was cleared, and he understood that he had truly met his own Guru. This Lila demonstrated that Baba was the essence of the Guru principle, manifesting as the chosen Guru of any devotee.