《左传·昭公·昭公七年》
孟僖子不满意自己对礼仪不熟悉，就学习礼仪，如果有精通礼仪的人就跟他学习。
孟僖子病不能相礼，乃讲学之，苟能礼者从之。
Meng Xizi was not satisfied with his own unfamiliarity with etiquette, so he studied etiquette. If there were people proficient in etiquette, he would study with them.