How does the analogy of the crystal in Chapter 19 explain how the Soul can appear in the world yet remain pure and untainted?

Chapter 19 uses a powerful analogy to explain the nature of the Soul. It states that the Soul appears in this world due to the actions of Maya, but it remains changeless and untainted. The text compares the Soul to a crystal. A crystal may appear red, black, or yellow depending on the color of an object placed near it, but the crystal itself does not change its color or nature. It remains pure and distinct from all colors. In the same way, the Soul, though appearing to be influenced by its worldly surroundings, remains intrinsically pure, formless, changeless, and self-luminous consciousness.