The grouping is Zhu Xi's (
朱熹, Southern Song dynasty). He extracted
大学 and
中庸 from 《
礼记》, paired them with 《
论语》 and 《
孟子》, and produced 《
四书章句集注》 (1190). From 1313 (Yuan) until 1905 (Qing), the imperial civil-service exams drew their questions from this set with Zhu Xi's commentary as canon — meaning a thousand years of Chinese officialdom were filtered through these four short books.