What does Chapter 19 identify as the ultimate duty of human birth, and what is the prescribed path to achieve it?

As detailed in Chapter 19, the ultimate duty and fulfillment of human birth is to attain eternity, fearlessness, liberation, independence, and the Supreme Self. The chapter is explicit that this liberation cannot be achieved without knowledge (Jnana). Furthermore, this essential knowledge is not attainable without detachment. The process begins when the mind starts to perceive the world and its affairs as transient and illusory, much like the fleeting arrangements of a dream. Without the science of the oneness of the Self, the text states there is no 'awakening' that can break the bonds of grief and delusion.