From a purely selfish standpoint, that is a lot more profitable than trying to improve others—yes, and a lot less dangerous. “Don’t complain about the snow on your neighbor’s roof,” said Confucius, “when your own doorstep is unclean.” When I was still young and trying hard to impress people, I wrote a foolish letter to Richard Harding Davis, an author who once loomed large on the literary horizon of America.