According to the teachings in Chapter 21, what is the fundamental nature of Saints and how are they interconnected?

Chapter 21 presents a profound teaching on the unity of Saints. It explains that although Saints may take incarnations in different places and at various times to fulfill specific purposes, they are all "essentially inseparable from one another." The chapter clarifies that while external factors like country and time may vary, the inner essence of these great souls is one. The text further states that the signs of one Saint are completely known by another, indicating a secret, underlying arrangement and a deep, unified consciousness among them.