Based on Chapter 19, what is the nature of the Supreme Being, and what is the ultimate goal for a person?

Chapter 19 presents the Supreme Being, or Purusha, as the ultimate reality that is subtler than all else, including the Soul and the Unmanifest (Maya). This Pure Brahman is described as the final destination where the senses and the mind find rest. The chapter posits that the primary duty and fulfillment of human birth is to strive for this state, which is characterized by eternity, fearlessness, liberation, and independence through the attainment of the Supreme Self. Therefore, as explained in Chapter 19, the purpose of life is not worldly pursuits but the spiritual journey towards realizing one's true nature and merging with this ultimate goal.