Based on Chapter 19, can you explain how the Soul remains untainted despite its appearance in the world?

Chapter 19 explains that the Soul, though appearing in the world due to the actions of Maya, remains fundamentally untainted and changeless. It uses the analogy of a crystal, which may appear red, black, or yellow depending on the color of an object placed near it, but the crystal itself remains pure, colorless, and distinct. Similarly, the chapter mentions illusions like a mirage, the glitter of silver on a seashell, or mistaking a coiled rope for a snake. Just as superimposing a snake on a rope is a false perception, the ego of identifying as the body ('I am the body') is a false bondage, as the Soul is inherently pure, formless, and self-luminous.