“Psychological motivation is the desire to change relations between two points, and so psychology is the study of equations with two unbound variables. ("America: Three Audiences")”

“Relative income uses two variables: the dollar and time, usually hours.”

“I studied psychology in school, and the best psychology is in literature. It's so much easier to understand a character than a theory. You can recognize yourself—or other people—in a different way.”

“You could tell them why they should hire you so very much better than I could. But they won't listen to you and they'll listen to me. Because I'm the middleman. The shortest distance between two points is not a straight line--it's a middleman. And the more middlemen, the shorter. Such is the psychology of a pretzel.”

“Two people can see the same thing, disagree, and yet both be right. It's not logical; it's psychological.”

“New start or not, there was a line to be drawn, and that line was singing musicals to yourself as serious psychological motivation.”