Could you describe what Chapter 19 identifies as the 'Pure Brahman' or the ultimate goal for a spiritual seeker?

In Chapter 19, the ultimate goal is identified as the 'Purusha' or 'Pure Brahman.' This is described as the final resting place for the senses and mind. The text presents a hierarchy of subtlety, stating that the Purusha is even subtler than the Soul and the Unmanifest (Maya). This Supreme Reality is the object that resides in everything, from the smallest atom to the vast universe. It is characterized as being self-luminous, pure consciousness, changeless, and formless. Attaining this state of being, which is described as the Supreme Self, is presented as the very fulfillment and duty of human birth.