Chapter 12 mentions removing 'the obsession with duality.' How is this concept and the nature of a saint's form explained in the text?

In Chapter 12 of the Sai Satcharitra, Sai Baba is praised as one who, 'through the knowledge of non-duality...remove[s] the obsession with duality even from the dull-witted.' This refers to the spiritual realization that all of existence is one, breaking down the illusion of separation. The chapter further describes the form of a saint like Sai by using an analogy: 'Just as the sky expands and fills all places, so is Your form depicted.' This suggests a form that is omnipresent, limitless, and inseparable from the Supreme Soul. The text reinforces this by stating that saints are the 'sun for the darkness of ignorance' and that in reality, 'they are inseparable from Him,' the Supreme Soul.