Can you explain the story of Sai Baba climbing a ladder onto a roof and what it teaches?

Chapter 19 recounts a miraculous incident where Sai Baba demonstrated both his divine power and a practical teaching. One day, he suddenly had a ladder placed against Vaman Gondkar's house and, despite his own physical weakness, he quickly climbed to the roof. From there, he crossed over to the adjacent roof of Radhakrishnabai, who was suffering from a high malarial fever. After returning, he immediately paid the ladder-man two rupees. When asked about this generous payment, Baba explained the core lesson: 'One should not take the burden of anyone's labor for free, not even a bit.' This story illustrates not only his ability to transcend physical limitations to help a devotee but also his emphasis on fair compensation in worldly affairs.