If society were a train, the etiquette would be the rails along which only the train could rumble forth; if society were a state coach, the etiquette would be the wheels and axis on which only the coach could roll forward.

• 假定社会是一列火车，礼仪就好比轨道，火车只能沿着它隆隆前进；假定社会是一辆马车，礼仪就好比轮子与轴，马车只有靠它们才能滚滚前进。