《宋书·列传·卷九十五》
边境百姓，烟火可以相望，狗吠鸡鸣的声音可以听到，但到老死时仍不相往来，不是很好吗？
边境之民，烟火相望，鸡狗之声相闻，至老死不相往来，不亦善乎！
The smoke from the fires of the border villagers can be seen from one side to the other, and the barking of dogs and the crowing of roosters can be heard, but they do not interact until they die; is that not good?