“All human behavior has a reason. All behavior is solving a problem.”

“Everyone has a theory of human nature. Everyone has to anticipate the behavior of others, and that means we all need theories about what makes people tick.”

“Problems of human behavior still continue to baffle us, but at least in the Library we have them properly filed.”

“Codependents are reactionaries. They overreact. They under-react. But rarely do they act. They react to the problems, pains, lives, and behaviors of others. They react to their own problems, pains, and behaviors.”

“All human behavior, all human motivations, all man’s hopes and fears, were heavily colored and largely controlled by mankind’s tragic and oddly beautiful pattern of reproduction.”

“The ''self-image'' is the key to human personality and human behavior. Change the self image and you change the personality and the behavior.”