Acharya Prashant explains the teachings of Sage Yagyavalkya regarding the nature of the self, which is described as a homogeneous mass of intelligence without inside or outside. He clarifies that the concepts of 'inside' and 'outside' are mere illusions created by the ego and the physical boundary of the skin. As long as one lives in dualistic consciousness, perceiving oneself as an isolated entity separate from the universe, one cannot realize Brahman. The speaker emphasizes that the individual and the universe are an integrated whole; changing any parameter of the universe affects the individual, and vice versa. The sense of having to negotiate or deal with the world is described as a curse arising from the ego's need to make itself and the world important.