《汉书·传·楚元王传》
孔子把母亲葬在防，称赞古时修墓不建坟，说： 丘是东西南北四处周游的人，不可以不做标记。 
孔子葬母子防，称古墓而不坟，曰： 丘，东西南北之人也，不可不识也。 
Confucius buried his mother in Fang and praised the ancients for repairing tombs without building mounds, saying: Qiu is a person who travels east, west, south, and north, and cannot be unmarked.