One example that shows how characterization develops the theme of friendship in of mice and men

Despite George's frustrations with Lennie, they still cherish their relationship. They frequently repeat the significance of their relationship to make themselves feel better:

"With us it ain't like that. We got a future. We got somebody to talk to that gives a damn about us. We don't have to sit in no bar room blowin' in our jack jus' because we got no place else to go. If them other guys gets in jail they can rot for all anybody gives a damn. But not us."

Lennie broke in. "But not us! An' why? Because… because I got you to look after me, and you got me to look after you, and that's why." He laughed delightedly. "Go on now, George!"