How does Chapter 5 describe the mindset of a truly wise person, and who narrated these events?

Chapter 5 delves into the nature of a wise person, explaining that their actions are dictated by previous karma, and they are not the doer of karma. It uses a powerful metaphor, stating that a wise person would only experience duality if the sun itself could enter darkness. For such a person, whose own form is the entire universe, they reside in non-duality. The chapter also clarifies the source of this story, mentioning that the account of the Guru and disciple was made known by Mahalsapati, a great devotee of Sainath, and has been told exactly as it happened.