Can you explain the story of Sai Baba climbing a ladder onto a roof and what lesson he was trying to teach?

Chapter 19 recounts a fascinating incident where Sai Baba taught a profound lesson through a seemingly strange act. One day, he suddenly asked for a ladder, had it placed against a house, and climbed onto the roof. From there, he crossed over to the adjacent roof of Radhakrishnabai, who was suffering from a high malarial fever. After coming down, he immediately paid the man who brought the ladder two rupees. When questioned about the generous payment, Baba explained, "One should not take the burden of anyone's labor for free, not even a bit." This story, described in Chapter 19, teaches the important principle of always compensating people fairly for their work.