According to Chapter 21, what is the underlying nature and relationship between different Saints, even if they appear in different times and places?

Chapter 21 explains that while Saints may take incarnations in different places and at different times for specific purposes, they are fundamentally inseparable from one another. The text states that although the country, time, and objects associated with them may differ, the signs of one Saint are completely known by another. As Chapter 21 reveals, the ancient institutions and secret arrangements of Saints are such that 'inwardly, they are all one.' This highlights a profound, interconnected unity among all true Saints and Sages, suggesting they are part of a single, divine consciousness and are not different in essence.