According to the provided text, what determined Sai Baba's specific 'method of grace' for any given individual?

The source material clarifies that Sai Baba's approach was highly individualized and not based on a single, rigid rule. Chapter 27 explains that the 'method of grace is determined' by several factors unique to the devotee. These include the person's authority, their specific mental disposition, their history of service, and the depth of their love and devotion. This is why his actions could seem surprising; he might use a clever trick for one person, like a doctor hiding medicine with jaggery, or grant a wish through casual humor to another. His wonderful acts were tailored to the devotee's state, as he knew both the greatness of the scriptures and the heart of the devotee seeking his blessing.