Can you explain the philosophical concept of non-duality as it relates to Sai Baba in Chapter 12?

In Chapter 12, Sai Baba is described as a being who helps others transcend worldly illusions through the principle of non-duality. The text refers to him as the 'embodiment of Truth, Consciousness, and Bliss' who 'stills the waves of worldly existence.' It explicitly states that through the 'knowledge of non-duality, You remove the obsession with duality even from the dull-witted.' This suggests that Sai Baba's teachings and presence help individuals see beyond the false separation of friend and foe, good and evil, or self and other, guiding them toward the understanding of a single, unified reality.