How does the character, Julian Penrose, serve as an example of compromise?

Julian has lived with compromise all his life. His polio has forced him to find ways to be happy in a world that was not particularly accommodating to men in wheelchairs, and he has lived for years with the knowledge that Arthur Winner and Marjorie Penrose had had an affair. As a result of his understanding of compromise and living with diminished capabilities, he is the one who counsels Arthur not to expose Noah Tuttle.