陌生人是群体本身的一个元素,与穷人和各种“内部敌人”并无不同——一个在群体中的成员身份既涉及在其外部又涉及面对它的元素。
All wealth is the product of labor.
如果你想发展,就必须愿意适应变化。
I don't think that everyone should become a mathematician, but I do believe that many students don't give mathematics a real chance.
Your most unhappy customers are your greatest source of learning.