化学是我们日常生活的无声建筑师。
幸福和不幸取决于我们对事物的看法。
书籍是智慧的钥匙。
聪明好学,不以向地位低下的人请教为耻,所以称他为“文”。
A moral being is one who is capable of reflecting on his past actions and their motives.