《太平广记·卷八·神仙八》
晋代的葛洪在他的道学著作《抱朴子》中说过，如果人们不走夜路，怎么会知道路上有走夜路的人呢？
《抱朴子》曰： 洪闻谚书有之曰： 子不夜行，则安知道上有夜行人？ 
Ge Hong of the Jin Dynasty said in his book "Bao Puzi", if people don't follow the night path, how can they know there are nocturnal travelers on the road?