As to a “science” of human conduct, I have mentioned some difficulties, notably that one of the most distinctive traits of man is make-believe, hypocrisy, concealment, dissimulation, deception. He is the clothes-wearing animal, but the false exterior he gives to his body is nothing to that put on by his mind.
Frank Knight, “The Role of Principles in Economics and Politics” p.11
Frank Knight, “The Role of Principles in Economics and Politics” p.11