How does the incident with the book at Shama's house demonstrate a key teaching about discipline?

The incident at Shama's house provides a powerful lesson on discipline. As Chapter 18 recounts, after Baba sent the narrator to Shama, the narrator happened to pick up the book of Nath Bhagawat. The book miraculously opened to the exact portion he had lazily neglected to read earlier that morning. This was not a mere coincidence; the narrator instantly understood its significance. He realized that Baba had orchestrated the entire event, from knowing his inner thoughts of envy to sending him on an errand, all to ensure he completed his reading. This powerful experience taught him that Baba enforces spiritual discipline and that "Discipline means regular reading," leaving no room for laziness in one's devotional practice.