ESSENTIAL QUESTION
This is a good question for the author of this book. John Singer, who is deaf in the book, cannot communicate with most people in the world because he cannot speak; Mick Kelly cannot communicate with anyone in her family because they do not share her wisdom and ambition; Biff Brannon is alone after his wife dies and does not want to open up to others. Communication became their biggest obstacle, and that's why they were isolated. So that communication becomes an important part of their life in the society, lack of communication may lose a lot of opportunities in the society.