Based on the provided text, what is the meaning of 'discipline' and how did Baba enforce it?

In the context of the narrative from Chapter 18, 'discipline' is explicitly defined as 'regular reading.' The narrator had failed in this discipline by neglecting his study of the Nath Bhagawat in the morning due to laziness. Sai Baba, perceiving this, engineered a situation to correct the lapse. He sent the narrator on an errand to Shama, where the opportunity arose for the narrator to complete the very portion of the book he had skipped. The narrator understood this as Baba enforcing discipline, which means that one should not move from their place of regular worship without peacefully completing their study. This incident underscores the importance Baba placed on fulfilling one's spiritual practices with consistency.