According to Chapter 21, what is the underlying nature and relationship between different Saints?

Chapter 21 explains that Saints are 'essentially inseparable from one another,' even if they appear in different places, times, or forms. The text describes this as a 'secret arrangement' among them. It posits that while the country, era, and physical objects associated with them may differ, they are all inwardly one and can recognize each other completely. The chapter teaches that they take incarnations for specific purposes, but their core spiritual essence is unified, making them part of a single, indivisible spiritual reality.