英語翻譯
Because of this objective "proof" it very seldom occurs to a person that his trouble lies in his self-image or his own evaluation of himself.Tell the schoolboy that he only "thinks" he cannot master algebra,and he will doubt your sanity.He has tried and tried,and still his report card tells the story.Tell the salesman that it is only an idea that he cannot earn more than a certain figure,and he can prove you wrong by his order book.He knows only too well how hard he has tried and failed.Yet,as we shall see later,almost miraculous changes have occurred both in grades of students,and in the earning capacity of salesmen - when they were prevailed upon to change their self-images.