Every mathematical theorem is a story, a narrative that unfolds through logic and reason, leading to a deeper understanding of the world.

建筑应该是安静的，但不是沉默的。

对于非礼的事，上等到的士人根本不想；对于非礼的事，中等的士人从来不说；对于非礼的事，下等的士人紧闭门户。