According to Chapter 21, what is the fundamental connection between different saints, regardless of their time or place?

Chapter 21 explains that all saints are intrinsically connected and are essentially one, despite appearing in different forms or locations. The text states that saints may take incarnations in various places for specific purposes, but "they are essentially inseparable from one another." This chapter highlights the idea that while their external circumstances like country and time may differ, "inwardly, they are all one." The signs of one saint are completely understood by another, suggesting a shared, universal consciousness among them, a secret arrangement of these great souls.