Men are born ignorant， not stupid； they are made stupid by education.

The only real voyage of discovery consists not in seeking new landscapes, but in having new eyes.

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。

追求知识是一场没有终点的旅程。