How does the source reconcile the idea of a formless, non-dual Brahman with the worship of a deity with form, like Sai Baba?

The text explains this by stating that the original, formless one, who is beyond qualities, takes on a form for the welfare of devotees. Chapter 1 posits that this being, who is unique from a philosophical viewpoint, remains separate to allow for the joy of devotion and the divine play between God and devotee. This is exemplified in Sai, who is described as the with-form manifestation of pure Brahman-consciousness. The Shruti is cited, saying 'The one does not enjoy alone,' which leads to the loving impulse 'Let me be many,' allowing for a temporary duality for devotion before merging back into oneness.