《三国志·魏书·文帝纪》
汉文帝墓保存完好，是因为霸陵中没有什么让人贪图的东西；光武帝的陵墓被发掘，是因为原陵造墓种树的缘故。
汉文帝之不发，霸陵无求也；光武之掘，原陵封树也。
Emperor Wen of Han's tomb was well-preserved because there was nothing in the Ba Mausoleum to make people want to steal from it. Emperor Guangwu's tomb was excavated because trees had been planted in the Yuan Mausoleum when it was built.