How does the author use these words to move the action of the story forward? Chapter 21 of The Giver

He is also making the choice that Gabriel’s individual life is more precious than the convenience of the community. At the same time, however, Jonas is making choices that affect the entire community, acting in what he considers their self-interest. This choice, though, opposes another fundamental rule of the society: everything should be done to avoid pain and discomfort. Jonas’s escape will cause the entire community great anguish for long periods of time until they have come to grips with the difficult memories he leaves behind him.