Arnold Bennett 
Mental Efficiency And Other Hints 

No one is a worse guide to success than your typical successful man. He seldom understands the reasons of his own success; and when he is asked by a popular magazine to give his experiences for the benefit of the youth of a whole nation, it is impossible for him to be natural and sincere. He knows the kind of thing that is expected from him, and if he didn’t come to London with half a crown in his pocket he probably did something equally silly, and he puts that down, and the note of the article or interview is struck, and good-bye to genuine truth!