《魏书·列传·卷四十三》
《礼记》说周人 养众老于学校，学校在国都四郊 ，《礼》又说： 天子设立四学，当入学而太子立。 
以臣愚量，同处无嫌。且今时制置，多循中代，未审四学应从古不？
The Book of Rites states that the people of Zhou raised their elderly in schools. Schools were in the four suburbs of the capital city. The Book of Rites also states that the emperor set up four schools, and the prince set up upon school entry. 