“Any preoccupation with ideas of what is right or wrong in conduct shows an arrested intellectual development.”

“The fact that man knows right from wrong proves his intellectual superiority to the other creatures; but the fact that he can do wrong proves his moral inferiority to any creatures that cannot.”

“The ideas of economists and political philosophers, both when they are right and when they are wrong are more powerful than is commonly understood. Indeed, the world is ruled by little else. Practical men, who believe themselves to be quite exempt from any intellectual influences, are usually slaves of some defunct economist.”

“The secret to eternal youth is arrested development”

“Ideas are not intellectuals' toys: ideas have consequences, for good and for ill, in what even intellectuals sometimes call "the real world".”

“You're not a moron. You're only a case of arrested development.”