1. 四辟
1. 明于天，通于圣，六通四辟于帝王之德者，其自为也，昧然无不静者矣！
The Nature doesn`t make concealed reference to something.
2. 古之人其备乎！配神明，醇天地，育万物，和天下，泽及百姓，明于本数，系于末度，六通四辟，小大精粗，其运无乎不在。
Scholars from Zhou and Lu were well acquainted with the relative poem, history, etiquette and music, which were also the topics studied by many other schools.