According to Chapter 21, what is the underlying unity and secret arrangement among different Saints?

Chapter 21 explains the secret arrangements and ancient institutions of Saints, suggesting a profound unity among them. It posits that while Saints may take incarnations in different places and at different times for specific purposes, they are essentially inseparable from one another. The text states that although the country, time, and objects may differ, the signs of one Saint are completely known by another. This highlights a key concept presented in Chapter 21: inwardly, all Saints are one, part of a single, interconnected spiritual reality.