Based on Chapter 39, what was the primary reason for Sai's incarnation and his arrival in Shirdi?

Chapter 39 of the Shri Sai Satcharitra explains that Sai Baba's arrival in Shirdi was not a random event but a deliberate act born out of great concern for the upliftment of his devotees. The text emphasizes that while individuals like Chand Patil were instruments, Sai came to Shirdi of his own accord. His purpose was to uplift a specific group of people: the "dull-witted, the fallen, and the poor," as well as those who were simple, faithful, and lacked formal vows or penance. This passage from Chapter 39 suggests that Sai's mission was to provide salvation and grace to the humble and the marginalized.