做你自己,因为别人已经有人做了。
Be yourself; everyone else is already taken.
If a man will begin with certainties, he shall end in doubts; but if he will be content to begin with doubts, he shall end in certainties.
儿童的进步不是取决于年龄,而是取决于能够自由地观看他周围的一切。
Mathematics is not just about numbers, equations, computations, or algorithms: it is about understanding.