What does Chapter 21 reveal about the fundamental unity and nature of Saints across different times and places?

Chapter 21 presents a profound insight into the nature of Saints, stating that they are all fundamentally interconnected. According to the chapter, Saints may take incarnations in different places and at different times for specific purposes, but they are "essentially inseparable from one another." The text explains that even though the country, time, and external circumstances may differ, the signs of one Saint are completely known by another. This is because, as Chapter 21 powerfully concludes on this topic, "Inwardly, they are all one." This suggests a secret, unified spiritual arrangement that transcends individual appearances.