Based on the teachings in Chapter 19, what is presented as the ultimate duty and fulfillment of human birth?

Chapter 19 presents the ultimate fulfillment and duty of human birth as the attainment of the Supreme Self. Achieving this state brings what the text describes as eternity, fearlessness, liberation, and independence. The chapter emphasizes that this liberation is not possible without knowledge, and knowledge, in turn, cannot be attained without detachment. This detachment arises only when the mind truly perceives the world as transient and understands the false nature of the ego. Just as a tiny banyan seed holds the potential for a massive tree, this human birth holds the potential for realizing the Supreme Self, which is its highest purpose.