According to Chapter 21, what is the relationship between different Saints, and how do they operate?

Chapter 21 teaches that Saints, despite appearing in different countries, times, and forms for specific purposes, are all essentially one and inseparable from each other. The text explains that the signs of one Saint are completely known by another, highlighting an inner unity among them. As described in the chapter, their ancient institutions and secret arrangements work in mysterious ways. Even though they may take incarnations in whatever place they like, they are inwardly all one, working towards a common, divine purpose.