According to Bernard at the end of Section 9, what is the best way to maintain a relationship?

Bernard emphasizes the importance of simplistic communication as the best way to maintain a relationship at the end of Section 9. He uses the theme of communicating in the manner of a child as the way of showing how people can best communicate. In this way, the reader is reminded of the Section 1 and any other subsequent sections (4 and 8) wherein the characters all communicate in a child-like, simplistic manner.