How does Chapter 19 explain the concept of Pure Brahman and its appearance in the world through Maya?

Chapter 19 teaches that the Soul, which is Pure Brahman, appears in this world through the actions of Maya, also called the Unmanifest Nature. To illustrate this, the text uses the powerful analogy of a crystal. A crystal is inherently pure and free from color, but it appears to take on the color of any object placed near it, be it red, black, or yellow. Similarly, the Soul, which is self-luminous, pure consciousness, and formless, remains untainted and distinct from the body, senses, and mind, even as it appears to be associated with them. Just as the crystal remains pure, the Soul remains changeless despite its worldly appearance.