《汉书·传·贾谊传》
《学礼》说： 帝入东学，懂得尊敬亲属，重视仁爱，于是亲、疏有了序别而恩德都能施加到了；帝入南学，懂得尊敬老年人，注重信义，于是长幼有了区别而民众互相不欺骗；帝入西学，懂得尊敬贤良，注重道德，于是圣贤聪明的人得到任用而有功之人不被遗漏；帝入北学，懂得尊敬有地位的人，崇尚爵禄，于是贵贱之分有了等级而卑下的人不超越自己的身份；帝入太学，从师请教治国的道理，回来练习并接受太傅的考核，太傅惩罚他不合标准的地方，而改正不足之处，于是，德行和智慧增长了，治国的办法也学到了。
《学礼》曰： 帝入东学，上亲而贵仁，则亲疏有序而恩相及矣；帝入南学，上齿而贵信，则长幼有差而民不诬矣；帝入西学，上贤而贵德，则圣智在位而功不遗矣；帝入北学，上贵而尊爵，则贵贱有等而下不逾矣；帝入太学，承师问道，退习而考于太傅，太傅罚其不则而匡其不及，则德智长而治道得矣。
"School Rites" states that:  When the emperor enters the East School, he learns to respect relatives and values kindness, so that the order between relatives and non-relatives is established, and kindness can be given to everyone; when the emperor enters the South School, he learns to respect the elderly and emphasizes trustworthiness, so that there is a distinction between the old and the young, and people do not deceive each other; when the emperor enters the West School, he learns to respect the virtuous and emphasizes morality, so that the wise and capable people are employed and the meritorious people are not neglected; when the emperor enters the North School, he learns to respect those in high positions and admires titles and salaries, so that there is a distinction between the noble and the humble, and the humble do not exceed their status; when the emperor enters the Imperial College, he asks his teachers for advice on how to govern the country, practices and accepts the assessment of the Grand Tutor, the Grand Tutor punishes him for his shortcomings and corrects his shortcomings, so that his virtues and wisdom grow, and he also learns how to govern the country.