According to Chapter 5, how are the concepts of non-duality and karma connected to the actions of a wise person?

Chapter 5 explains that for a wise person, spiritual welfare is achieved by acting without pride, as cleverness of the intellect is of no use. The text states that the bodily activities of a wise man occur according to previous karma, but he is not the 'doer' of the karma and does not feel its burden. This detachment is connected to the concept of non-duality. The chapter posits that a wise man having a sense of duality would be as impossible as the sun entering darkness. For such a person, their 'own form is the entire universe,' and they reside in a state of non-duality. This philosophical insight in Chapter 5 frames the state of desirelessness and wisdom that amazed the people of Shirdi when they observed the young Sai Baba.