According to Chapter 19, what is the root cause of experiencing pleasure and pain, and what is the prescribed path to liberation?

Chapter 19 states that the experience of pleasure and pain is unavoidable as long as a person maintains an ego regarding their body, intellect, and mind. This sense of self creates the illusion of being a "doer" and "enjoyer." The path to liberation, therefore, begins with knowledge, which cannot be attained without detachment. The text clarifies that this sense of detachment will not spark until the mind fully perceives the world as transient. The ultimate fulfillment of human birth is defined as achieving eternity, fearlessness, liberation, and the attainment of the Supreme Self.