《明史·列传·卷三》
昔日周公教育成王严格整顿军队，召公教导康王设立皇家六师，这么做都是为了居安思危，不忘武备。
昔周公教成王克诘戎兵，召公教康王张皇六师，此居安虑危，不忘武备。
In earlier times, the Duke of Zhou educated King Cheng by strictly organizing the army, while the Duke of Shao taught King Kang by organizing the six royal teachers. They did all this because they anticipated danger even in times of peace and did not forget to prepare for war.