“Negatives are usually said loud and clear, with vigorous enforcement, while positives often fall like raindrops on the stream of life, making little sound and only small ripples. ‘Work hard!’ is found in copybooks, but ‘Stop loafing!’ is more likely to be heard in the home. ‘Always be on time’ is an instructive motto, but ‘Don’t be late!’ is heard more frequently in real life, and ‘Don’t be stupid!’ is more popular than ‘Be bright!”