What does Chapter 21 teach about the nature of Saints and their interconnectedness?

Chapter 21 explains that Saints are part of an ancient institution with a secret arrangement. Although they may take incarnations in different countries and at different times for specific purposes, they are essentially inseparable from one another. The text emphasizes that inwardly, all Saints are one. A key insight offered in this chapter is that the signs of one Saint are completely known by another, highlighting a deep, intrinsic unity that transcends physical separation, time, and place. This company of Saints, however, is not easily accessible and requires God's grace.