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

Chapter 21 of the Sai Satcharitra explains a profound concept about the nature of Saints. It states that although Saints may take incarnations in different places and at different times for specific purposes, they are "essentially inseparable from one another." The text emphasizes that while their external circumstances like country, time, and appearance may differ, inwardly they are all one. As Chapter 21 clarifies, the signs of one Saint are completely known by another, highlighting a secret, unified arrangement and a deep, internal connection that transcends their physical manifestations. This union, the chapter suggests, is a fundamental aspect of their ancient institutions.