According to the scriptures, what is the source of Sai Baba's unwavering inner peace, especially when faced with criticism?

The source of Baba's unwavering inner peace, as detailed in Chapter 46, was his profound spiritual state and worldview. He was an experiencer of supreme peace because He saw God in all beings, which prevented ignorance from touching Him. The text states He was firm in the vision of discrimination, which meant that anger could not arise. In fact, if an occasion for anger occurred, his 'storehouse of peace' would open instead. His constant meditation on 'Allah Malik' (God is the Master) and his nature as a treasure of knowledge and detachment contributed to this unshakable tranquility.