Chapter 19 details a hierarchy of subtlety in existence. Could you outline this hierarchy and explain what is considered the ultimate goal?

Chapter 19 describes a philosophical hierarchy based on subtlety. It begins with the Soul (Atma), which is called the Great Power. Subtler than the Soul is the Unmanifest (Avyakta), which is also referred to as Space or Maya. Finally, the chapter states that subtler than all of these is the Purusha, or the Supreme Being. This Purusha is presented as the ultimate destination and the final goal. It is described as the state where the senses and the mind finally find complete rest. The text explicitly equates this ultimate goal, the Purusha, with the Pure Brahman, the Supreme Reality.