What is the spiritual hierarchy of subtlety that leads to the Pure Brahman, as outlined in Chapter 19?

Chapter 19 outlines a specific hierarchy of subtlety on the path to the ultimate reality. The text begins by identifying the Soul (Atma) as a Great Power. It then states that there is something even subtler: the Unmanifest (Avyakta), which is also called Space, Unmanifest Nature, or Maya. However, the progression continues beyond this. As Chapter 19 explains, subtler than all these concepts is the Purusha, the Supreme Being. This Purusha is designated as the ultimate destination where the senses and the mind find their final rest. This state is equated with the ultimate goal itself, which is the Pure Brahman, providing a clear framework for understanding the path from the manifest to the unmanifest and beyond.