Describe the sequence of events, starting from Baba's instruction to the narrator, that led to the lesson about completing one's daily spiritual reading.

The sequence of events, as narrated in Chapter 18, began when Sai Baba, aware of the narrator's inner state, commanded him to go to Shama's house and collect fifteen rupees in Dakshina. Compelled by the order, the narrator left the Masjid and went to Shama, who was just finishing his bath and asked him to wait. During this pause, the narrator casually picked up the Nath Bhagawat from a window. Miraculously, the book opened to the very section he had neglected to read that morning due to laziness. This culmination made the narrator realize that Baba had masterfully arranged the entire scenario to enforce the discipline of regular, complete spiritual reading.